{"history":[],"article":{"id":"89c67ebd-0669-417b-9378-bc7807b7cccd","title":"Sora (bird)","slug":"sora-bird","content":":::summary\n![Sora](https://upload.wikimedia.org/wikipedia/commons/2/2d/Sora///%28Porzana///carolina%29.jpg)\n**Name:** Sora \n**Image 2:** Porzana carolina - Sora XC109542.mp3 \n**Image 2 Caption:** Whinny call recorded in Minnesota \n**Status:** LC \n**Status System:** IUCN3.1 \n**Genus:** Porzana \n**Species:** carolina \n**Authority:** ([Linnaeus](https://bliptext.com/articles/carl-linnaeus), [1758](https://bliptext.com/articles/10th-edition-of-systema-naturae)) \n**Range Map:** Porzana carolina map.svg \n**Synonyms:** Rallus carolinus Linnaeus, 1758 \n:::\n\n# \nThe **sora** (**Porzana carolina**) is a small waterbird of the rail family [Rallidae](https://bliptext.com/articles/rallidae), sometimes also referred to as the **sora** rail or **sora** crake, that occurs throughout much of North America.\nThe genus name Porzana is derived from [Venetian](https://bliptext.com/articles/venice) terms for small rails, and the specific carolina refers to the [Carolina Colony](https://bliptext.com/articles/carolina-colony).\nThe common name \"Sora\" is probably taken from a Native American language.\nAdult soras are 19 - 30 cm long, with dark-marked brown upperparts, a blue-grey face and underparts, and black and white barring on the flanks.\nThey have a short thick yellow bill, with black markings on the face at the base of the bill and on the throat.\nSexes are similar, but young soras lack the black facial markings and have a whitish face and buff breast.\nThey weigh about 49 - 112 g.\nThe sora's breeding habitat is [marshes](https://bliptext.com/articles/marsh) throughout much of [North America](https://bliptext.com/articles/north-america).\nThey nest in a well-concealed location in dense vegetation.\nThe female usually lays 10 to 12 [eggs](https://bliptext.com/articles/egg-biology), sometimes as many as 18, in a cup built from marsh vegetation.\nThe eggs do not all hatch together.\nBoth parents [incubate](https://bliptext.com/articles/incubate-bird) and feed the young, who leave the nest soon after they hatch and are able to fly within a month.\nThey [migrate](https://bliptext.com/articles/bird-migration) to the southern [United States](https://bliptext.com/articles/united-states) and northern [South America](https://bliptext.com/articles/south-america).\nSora is a very rare vagrant to western [Europe](https://bliptext.com/articles/europe), where it can be confused with [spotted crake](https://bliptext.com/articles/spotted-crake).\nHowever, the latter species always has spotting on the breast.\na streaked crown stripe, and a different wing pattern.\nSoras forage while walking or swimming.\nThey are [omnivores](https://bliptext.com/articles/omnivore), eating [seeds](https://bliptext.com/articles/seed), [insects](https://bliptext.com/articles/insect) and [snails](https://bliptext.com/articles/snail).\nAlthough soras are more often heard than seen, they are sometimes seen walking near open water.\nThey are fairly common, despite a decrease in suitable habitat in recent times.\nThe call is a slow whistled ker-whee, or a descending whinny.\n\n# Taxonomy\nThe sora was [formally described](https://bliptext.com/articles/species-description) by the Swedish naturalist [Carl Linnaeus](https://bliptext.com/articles/carl-linnaeus) in 1758 in the [tenth edition](https://bliptext.com/articles/10th-edition-of-systema-naturae) of his [Systema Naturae](https://bliptext.com/articles/systema-naturae).\nHe placed it with the rails in the [genus](https://bliptext.com/articles/genus) [Rallus](https://bliptext.com/articles/rallus) and coined the [binomial name](https://bliptext.com/articles/binomial-name) [Rallus](https://bliptext.com/articles/rallus) carolinus.\nLinnaeus based his description on the \"little American water hen\" that [George Edwards](https://bliptext.com/articles/george-edwards-naturalist) had described and illustrated in 1750 from a specimen collected near the Hudson Bay.\nLinnaeus also cited [Mark Catesby](https://bliptext.com/articles/mark-catesby) who had described the \"soree\" in his The Natural History of Carolina, Florida and the Bahama Islands.\nThe sora is now placed in the genus [Porzana](https://bliptext.com/articles/porzana) that was erected in 1816 by the French ornithologist [Louis-Pierre Vieillot](https://bliptext.com/articles/louis-pierre-vieillot).\nThe genus name is derived from [Venetian](https://bliptext.com/articles/venice) terms for small rails, the specific epithet refers to the [Carolina Colony](https://bliptext.com/articles/carolina-colony).\nThe common name \"Sora\" is probably taken from a Native American language.\nThe species in [monotypic](https://bliptext.com/articles/monotypic): no [subspecies](https://bliptext.com/articles/subspecies) are recognised.\n\n# Description\nAdult soras are 19 - 30 cm long, with dark-marked brown upperparts, a blue-grey face and underparts, and black and white barring on the flanks.\nThey have a short thick yellow bill, with black markings on the face at the base of the bill and on the throat.\nSexes are similar, but young soras lack the black facial markings and have a whitish face and buff breast.\nThey weigh about 49 - 112 g and have a wingspan of 35–40 cm. Soras have two common calls: a loud, squeaking \"whinny\" that decelerates and descends in pitch, often used to advertise territories; and a softer, ascending \"ker-wee\" or \"sor-ah\".\nThe latter call is sometimes presented as a possible origin for the species' common name.\n\n# Distribution and habitat\nThe sora is common across North America, naturally occurring in 49 US states (the exception being Hawaii), all 10 Canadian provinces and 2 Canadian territories.\nOutside of US/Canada, the species is found throughout Central America, the Caribbean, and northern South America.\nThe species has been recorded as a [vagrant](https://bliptext.com/articles/vagrancy-biology) in [Iceland](https://bliptext.com/articles/iceland), [Great Britain](https://bliptext.com/articles/great-britain), [Portugal](https://bliptext.com/articles/portugal), and at [Lake Titicaca](https://bliptext.com/articles/lake-titicaca).\nSoras breed from Nova Scotia northwest to southern Yukon and Northwest Territories, south to California, Arizona, and New Mexico and northeast to Pennsylvania and New England.\nSora wintering grounds include the [Caribbean](https://bliptext.com/articles/caribbean), northern portions of South America, including Ecuador, Colombia, and Venezuela, north through Central America and Mexico to southern California in the West and coastal regions of the Southeast.\nFrom southern Kansas south to northern and eastern Texas and east through the inland areas of the southeastern United States, soras are typically only observed during migration in the spring and fall.\nIn a few areas of the western United States, including central California and areas of Arizona and New Mexico, soras may occur year-round.\nThe size of an individual Sora's home range varies.\nSora brood-rearing home ranges in northwestern Iowa averaged 0.5 acre.\nIn Arizona, sora home range size varied from 1.5 acre in the early breeding season to over 2 acre in the postbreeding season.\nThese seasonal differences in sora home range size were not significant (p>0.05).\nDensities vary from to 12 soras/acre in Colorado to 0.47 pair/ha in Indiana.\nAn average of 1.3 soras/ha responded to calls across sites in Colorado.\nA similar density of soras was found in southeastern Wisconsin.\nIn Iowa, average density over 2 years and several marsh habitats was 1.3 pairs/ha.\n≥Landscape factors, such as marsh area, habitat edges within marshes, and the number of marshes in a region may influence soras.\nAlthough soras occur in marshes of all sizes, they may occur at higher densities in intermediate-sized marshes.\nSoras were significantly (p≤0.01) positively related with total wetland area and perimeter area of surface water in east and central Maine and were significantly (p<0.05) positively related to area of wetlands in Saskatchewan.\nIn Maine, soras used 10% of 2.5 acre wetlands, 40% to 50% of wetlands from 2.5 - 5 acre in size, and 20% of wetlands larger than 50 acre.\nIn western New York, soras were significantly (p=0.007) more abundant in marshes from 100 to 250 acre in size than in smaller (< 100 acre) or larger (250 - 380 acre) marshes.\nIn addition, sora nests were detected more often in the 100 - 200 acre marshes.\nSoras are commonly reported in plant communities dominated by [cattails](https://bliptext.com/articles/cattails) (Typha spp.), [sedges](https://bliptext.com/articles/sedges) (Carex spp.), [bulrushes](https://bliptext.com/articles/bul[rushes](https://bliptext.com/articles/juncus)) (Scirpus spp.), [smartweeds](https://bliptext.com/articles/smartweeds) (Polygonum spp.), [rushes](https://bliptext.com/articles/juncus) (Juncus spp.), [rice cutgrass](https://bliptext.com/articles/rice-cutgrass) (Leersia oryzoides), and [barnyard grasses](https://bliptext.com/articles/barnyard-grasses) (Echinochloa spp.).\nSoras also seem to prefer edge habitats.\nBreeding sora density was significantly (p<0.001) correlated (r=0.62) with the perimeter:area ratio of northwestern Iowa marshes.\nThe distance from the center of sora territories to a habitat edge was also significantly (p<0.005) less than from the center of Virginia rail territories.\nIn Arizona, habitat edges were closer to sora heavy use areas than random sites.\nWetland dynamics at a large scale can affect soras.\nIndices of sora population at 3 \"levels of response\" were significantly (p<0.01) correlated (r≥0.70) with the number of ponds present in the prairie pothole region of North Dakota in May.\nOutside of wetlands, soras are most often reported in cultivated areas during migration or in the postbreeding period.\nFor instance, a sora was observed 3 mi from marshland in a cultivated field in Iowa in the middle of August.\nA male sora was observed less than 1000 ft from a large wetland in a soybean (Glycine max) field in northwestern Iowa during the postbreeding period.\nFrom early June to mid-July, soras were observed on farms in Saskatchewan sown mainly with wheat (Triticum aestivum).\nSoras have also been reported in flooded wooded areas.\nIn western New York, soras occurred during the breeding season on a study site where 26% of the area was categorized as \"flooded timber,\" and 5% was classed as \"scrub/shrub marsh\".\nIn eastern and central Maine, an average of 2.1 soras was observed in wooded swamps per 100 hours of observation during the breeding season.\nOn a nonbreeding (August–April) site in southwestern Arizona, soras were found to use a \"mixed shrub community\" more than expected based on its availability.\nSoras were observed at low abundances on a site with [douglas-fir](https://bliptext.com/articles/douglas-fir) (Pseudotsuga menziesii), [ponderosa pine](https://bliptext.com/articles/ponderosa-pine) (Pinus ponderosa), and [trembling aspen](https://bliptext.com/articles/populus-tremuloides) (Populus tremuloides) in British Columbia.\nSoras use areas with a wide range of water depths.\nThey are often observed in water less than 1 ft deep, although the average water depth of sora heavy-use areas in Arizona was 20 in.\nIn northwestern Iowa, average water depth in sora territories was 15 in, which was significantly (p<0.025) more shallow than water depths at random locations in the marsh.\nSora nesting sites occurred in shallower water than random sites in western New York.\nAverage water depths reported at nest sites range from 4 in for 4 sora nests in Colorado to nearly 10 in for sora nests in western New York.\nIn areas of deep water, soras typically wade on mats of floating vegetation.\nWater level fluctuations may result in nest abandonment.\nFor example, at a site in Colorado where water level increased more than 8 in, a sora nest with 7 eggs was abandoned.\nIn Alberta, soras nested in more vegetation types during a drought year, most likely due to substantially reduced water levels in the vegetation used the previous year.\nSoras use areas with shallower water in fall than in spring.\nSoras typically avoid open water.\nThere is a significant (p≤0.05) negative relationship between area of open water and sora use of wetlands in Maine and sora relative abundance in Saskatchewan.\nIn western New York, sora nesting sites had a lower percentage of open water than random sites, and in Arizona soras used open water areas less than their availability.\nSora nesting sites had larger percentage of emergent vegetation than random sites in marshes of western New York.\nSora numbers in wetlands of northeastern North Dakota were significantly (p<0.05) positively correlated (r=0.45) with hectares of live emergent vegetation.\nIn east and central Maine, wetlands used by soras had significantly (p=0.01) greater area of emergent vegetation than unused wetlands.\nDensity of emergent vegetation in sora habitat varies.\nReported density of emergent vegetation ranges from an average of 121.9 stems/m2 in sora territories in northwestern Iowa to 333 stems/m2 on sites in northeastern Missouri used during fall migration.\nIn western New York, cover was greater than 70% at 95% of sora nests.\nIn addition, nesting sites had more horizontal cover at 20 inches (0.5 m) above water level than random sites.\nHowever, average stem density on sora territories was not significantly (p>0.05) different from random sites in northwestern Iowa.\nHeight of emergent vegetation in sora habitat also varies.\nIt ranged from 8 to 11 in in the spring after a winter disturbance in northwestern Iowa to 84 in in areas heavily used by soras in Arizona.\nIn marshes of western New York, average vegetation height at sora nesting sites was shorter than at random locations.\nHowever, the average height of emergent vegetation in sora territories in northeastern Iowa was not significantly (p>0.05) different from the height of vegetation in random plots.\nIn Arizona, both cover and height of vegetation used by soras varied with seasons.\nConway suggested the differences likely reflected the varied diet of the sora.\nThe availability of habitat in different seasons is another possible source of seasonal differences in sora habitat.\nExtent of woody vegetation surrounding South Dakota wetlands was not significantly (p=0.6) associated with sora occurrence.\nHowever, in marshes of western New York, there was a significant (p=0.041) negative relationship between percent flooded timber on a site and sora relative abundance.\nSoras may prefer some cover types.\nIn Arizona, 65.3% of sora use was in [southern cattail](https://bliptext.com/articles/southern-cattail) (Typha domingensis), although it accounted for only 16.5% of the vegetation.\n[Bulrushes](https://bliptext.com/articles/bulrushes) and a mixed-shrub community were also used more than their availability, while [saltcedar](https://bliptext.com/articles/saltcedar) (Tamarix chinensis) and [arrowweed](https://bliptext.com/articles/arrowweed) (Pluchea sericea) were avoided.\nA literature review notes sora avoidance of [purple loosestrife](https://bliptext.com/articles/purple-loosestrife) (Lythrum salicaria)-dominated sites.\nIn east and central Maine, wetlands used by soras had significantly (p=0.05) more ericaceous vegetation, such as [leatherleaves](https://bliptext.com/articles/leatherleaves) (Chamaedaphne spp.), [sweetgales](https://bliptext.com/articles/sweetgales) (Myrica spp.), and [laurels](https://bliptext.com/articles/laurels) (Kalmia spp.).\nIn marshes of northwestern Iowa, [broadleaf arrowhead](https://bliptext.com/articles/broadleaf-arrowhead) (Sagittaria latifolia) occurred in sora territories significantly (p<0.01) more often than at random sites.\nJohnson and Dinsmore imply that this likely results from both species preferring similar site conditions.\nIn May and June in Wisconsin, soras were detected significantly (p<0.025) more often in [cattail](https://bliptext.com/articles/cattail) (Typha spp.) survey areas than in sedge areas.\nHowever, in southeastern Wisconsin during the breeding season, there was no significant (p=0.943) difference in sora densities between habitats composed predominantly of cattail, sedge, or bulrush.\nIn addition, soras' use of [glaucous cattail](https://bliptext.com/articles/glaucous-cattail) (Typha × glauca), [broadfruit bur-reed](https://bliptext.com/articles/broadfruit-bur-reed) (Sparganium eurycarpum), [sedge](https://bliptext.com/articles/sedge), [river bulrush](https://bliptext.com/articles/river-bulrush) (Schoenoplectus fluviatilis), and [hardstem bulrush](https://bliptext.com/articles/hardstem-bulrush) (S. acutus var. acutus) habitats in marshes of northwestern Iowa generally reflected availability of these habitats.\nSeasonal differences in sora habitat use have been reported.\nIn northeastern Missouri in spring, the likelihood of detecting sora in robust emergents, such as cattail (Typha spp.) and [longroot smartweed](https://bliptext.com/articles/longroot-smartweed) (Polygonum amphibium var. emersum), was over 6 times that of detecting soras in these areas in fall.\nHowever, availability of habitats during various times of the year was not addressed.\nIn a study performed in southeastern Missouri, plant species used by sora during spring and fall migration differed significantly (p=0.005).\nHowever, the author qualifies this finding with his observation of major seasonal differences in vegetation availability.\nTemperature may also influence sora abundance.\nIn Colorado, average April temperature was significantly (p<0.01) negatively correlated (r= -0.94) with sora abundance.\nOn sites that had average April temperatures ≤ 42 F, soras were more abundant than the closely related [Virginia rail](https://bliptext.com/articles/virginia-rail) (Rallus limicola), while on warmer sites the sora to [Virginia rail](https://bliptext.com/articles/virginia-rail) ratio declined.\n\n## Migration\nThey [migrate](https://bliptext.com/articles/bird-migration) to the southern [United States](https://bliptext.com/articles/united-states), the [Caribbean](https://bliptext.com/articles/caribbean), and northern [South America](https://bliptext.com/articles/south-america).\nSora is a very rare vagrant to western [Europe](https://bliptext.com/articles/europe), where it can be confused with [spotted crake](https://bliptext.com/articles/spotted-crake).\nHowever, the latter species always has spotting on the breast.\na streaked crown stripe, and a different wing pattern.\nSoras forage while walking or swimming.\nThey are [omnivores](https://bliptext.com/articles/omnivore), eating [seeds](https://bliptext.com/articles/seed), [insects](https://bliptext.com/articles/insect) and [snails](https://bliptext.com/articles/snail).\nAlthough soras are more often heard than seen, they are sometimes seen walking near open water.\nThey are fairly common, despite a decrease in suitable habitat in recent times.\nThe call is a slow whistled ker-whee, or a descending whinny.\nThe use of call broadcasts greatly increases the chances of hearing a sora.\nCall broadcasts can also increase the chances of seeing a sora, as they will often investigate the source of the call.\nSora's northern migration occurs in spring, primarily in April and May.\nFor instance, in east-central Kansas significantly (p<0.05) more soras were detected from 24 April to 7 May than the 2-week periods before or after.\nIn southeast Missouri, soras were observed from 25 March to 6 May.\nSoras were first detected in April to early May in Colorado, Iowa, and Minnesota.\nIn a summary of the first detections of soras in Minnesota, Manitoba, and Saskatchewan, all occurred in April.\nSoras depart their breeding grounds as early as July and as late as October.\nSoras were observed returning to wintering grounds in Arizona as early as late July.\nAlthough local movements may obscure migration occurring in July, most migration occurred in August and September in Colorado.\nIn northern Ohio, sora abundance was increased in late August and September by migrating individuals.\nIn southeastern Missouri, soras were observed from 5 September to 27 October.\nSoras have been observed in Manitoba and Saskatchewan as late as October.\n\n# Behavior and ecology\n\n## Breeding\nAlthough sora nesting activities have been observed from late April through early August, the peak nesting period typically occurs from May to early July.\nIn New York, nesting was initiated in late April.\nA nest search and literature review study of soras in Colorado reports a clutch initiated in early August.\nHowever, mean clutch initiation dates occurred in May and June in regions across the state.\nStudies from northern Ohio, North Dakota, and Alberta report nesting from May to July.\nIn a review, sora nests with eggs were recorded from early May to early July in Indiana.\nThe sora's breeding habitat is [marshes](https://bliptext.com/articles/marsh) throughout much of [North America](https://bliptext.com/articles/north-america).\nThey nest in a well-concealed location in dense vegetation.\nThe female usually lays 10 to 12 [eggs](https://bliptext.com/articles/egg-biology), sometimes as many as 18, in a cup built from marsh vegetation.\nThe eggs do not all hatch together.\nBoth parents [incubate](https://bliptext.com/articles/incubate-bird) and feed the young, who leave the nest soon after they hatch and are able to fly within a month.\nSora females begin construction of saucer-shaped nests on the ground or on a platform over shallow water at the start of egg laying.\n[Clutch sizes](https://bliptext.com/articles/avian-clutch-size) typically range from 8 to 13 eggs, although clutch sizes of up to 16 have been reported.\nBoth parents incubate the eggs.\nIncubation lasts approximately 19 days, although a wide range of incubation periods has been reported in the literature.\nEggs hatch over a span of 2 to 13 days.\nNestlings are precocial and are capable of walking and swimming short distances (< 3 ft) by the end of their first day.\nYoung soras are independent by about 4 weeks of age.\nSoras brood once per season.\nSome late broods may be second nesting attempts, but there is only one report in the literature of a second brood attempt after a successful nest.\nFor information on breeding behavior of soras, see.\nFor information on conspecific nest parasitism and egg discrimination in soras see.\nSora nest success rates vary across locations and years.\nIn the literature addressing sora apparent nest success, the proportions of successful nests varied from 0.61 in Michigan to 0.833 in Minnesota.\nIn western New York, the nest success rate of 6 sora nests was 0.43, and the daily nest success rate was 0.97.\nUsing data from the Cornell Laboratory of Ornithology's nest record program, nesting success rate of soras in North America was estimated as 0.529 over a 28-day period (n=108).\nOn a site in Alberta, 80.6% of eggs successfully hatched, while the following year only 59.6% of eggs hatched.\nThe authors conclude that diminished water level interacting with predators and trampling by cattle resulted in decreased hatching success.\nDuring late summer, soras are flightless for a period during their post-nuptial molt.\n\n## Food and feeding\nSoras eat a wide range of foods.\nAnimals that are commonly reported as sora food items include [snails](https://bliptext.com/articles/snails) (Gastropoda), [crustaceans](https://bliptext.com/articles/crustaceans) (Crustacea), [spiders](https://bliptext.com/articles/spiders) (Araneae), and [insects](https://bliptext.com/articles/insects) (Insecta), mainly [beetles](https://bliptext.com/articles/beetles) (Coleoptera), [grasshoppers](https://bliptext.com/articles/grasshopper) (Orthoptera), [flies](https://bliptext.com/articles/flies) (Diptera), and dragon[flies](https://bliptext.com/articles/flies) (Odonata).\nSoras often eat the seeds of plants, such as [smartweeds](https://bliptext.com/articles/smartweeds), [bulrushes](https://bliptext.com/articles/bulrushes), [sedges](https://bliptext.com/articles/sedges), and [barnyard grasses](https://bliptext.com/articles/barnyard-grasses).\nSeeds of annual [wildrice](https://bliptext.com/articles/zizania-aquatica) (Zizania aquatica) and [rice cutgrass](https://bliptext.com/articles/rice-cutgrass) are eaten by soras in the eastern United States.\nA literature review lists [crowngrass](https://bliptext.com/articles/paspalum) (Paspalum spp.) and [rice](https://bliptext.com/articles/oryza-sativa) (Oryza sativa) as relatively important food sources for soras in the Southeast.\nPlants composing less than 5% of the sora's diet are also listed and include [spikerushes](https://bliptext.com/articles/eleocharis) (Eleocharis spp.), [duckweeds](https://bliptext.com/articles/duckweeds) (Lemnaceae), [pondweeds](https://bliptext.com/articles/potamogeton) (Potamogeton spp.), [panicgrasses](https://bliptext.com/articles/panicum) (Panicum spp.), [cordgrasses](https://bliptext.com/articles/spartina) (Spartina spp.), and [saltgrass](https://bliptext.com/articles/distichlis-spicata) (Distichlis spicata).\nSoras eat more plant food in fall and winter (68%–69%) than in spring and summer (40%).\nPlant material such as [hairy crabgrass](https://bliptext.com/articles/digitaria-sanguinalis) (Digitaria sanguinalis), [fall panicgrass](https://bliptext.com/articles/panicum-dichotomiflorum) (Panicum dichotomiflorum), and [bristlegrass](https://bliptext.com/articles/setaria) (Setaria spp.) occurred at substantially higher frequencies and in much larger volumes in sora esophagi collected in southeastern Missouri during fall migration than those collected in spring.\nIn addition, animals were a larger volume of the spring diet than the fall diet.\nThe volume of animal material in esophagi collected in spring was predominantly composed of adult beetles and snails from the [Physidae](https://bliptext.com/articles/physidae) family.\n# [Sora foraging in water | upload.wikimedia.org/wikipedia/commons/8/82/Porzana///carolina.jpg]\n\n## Survival\nFew data are available on the survival of soras.\nRadio-marked soras in Arizona had a nonbreeding survival probability of 0.308.\nThe authors suggest the low survival rate may be due to increased mortality of radio-marked birds.\nLikely causes of mortality are predation and human-caused sources such as road kill.\nSora eggs are eaten by several species including [American minks](https://bliptext.com/articles/mustela-vison) (Neogale vison), [skunks](https://bliptext.com/articles/mephitidae) (Mephitidae), [coyotes](https://bliptext.com/articles/canis-latrans) (Canis latrans), [grackles](https://bliptext.com/articles/quiscalus) (Quiscalus spp.), [crows](https://bliptext.com/articles/corvus-genus) (Corvus spp.), and [herons](https://bliptext.com/articles/ardeidae) (Ardeidae).\nPredation of adult soras by American minks, coyotes, and [hawks and owls](https://bliptext.com/articles/birds-of-prey) have been reported.","current_revision":null,"created_by":"kACnuQmH5k9Nr5VNVEpVeg7XpvUmMctD","created_at":"2025-01-25T19:07:14.004Z","updated_at":"2025-01-25T19:07:14.004Z","search_vector":"'bird':2 'sora':1","search_content":" \n \n**Name:** Sora \n**Image 2:** Porzana carolina - Sora XC109542.mp3 \n**Image 2 Caption:** Whinny call recorded in Minnesota \n**Status:** LC \n**Status System:** IUCN3.1 \n**Genus:** Porzana \n**Species:** carolina \n**Authority:** ([Linnaeus](https://bliptext.com/articles/carl-linnaeus), [1758](https://bliptext.com/articles/10th-edition-of-systema-naturae)) \n**Range Map:** Porzana carolina map.svg \n**Synonyms:** Rallus carolinus Linnaeus, 1758 \n \n\n# \nThe **sora** (**Porzana carolina**) is a small waterbird of the rail family [Rallidae](https://bliptext.com/articles/rallidae), sometimes also referred to as the **sora** rail or **sora** crake, that occurs throughout much of North America.\nThe genus name Porzana is derived from [Venetian](https://bliptext.com/articles/venice) terms for small rails, and the specific carolina refers to the [Carolina Colony](https://bliptext.com/articles/carolina-colony).\nThe common name \"Sora\" is probably taken from a Native American language.\nAdult soras are 19 - 30 cm long, with dark-marked brown upperparts, a blue-grey face and underparts, and black and white barring on the flanks.\nThey have a short thick yellow bill, with black markings on the face at the base of the bill and on the throat.\nSexes are similar, but young soras lack the black facial markings and have a whitish face and buff breast.\nThey weigh about 49 - 112 g.\nThe sora's breeding habitat is [marshes](https://bliptext.com/articles/marsh) throughout much of [North America](https://bliptext.com/articles/north-america).\nThey nest in a well-concealed location in dense vegetation.\nThe female usually lays 10 to 12 [eggs](https://bliptext.com/articles/egg-biology), sometimes as many as 18, in a cup built from marsh vegetation.\nThe eggs do not all hatch together.\nBoth parents [incubate](https://bliptext.com/articles/incubate-bird) and feed the young, who leave the nest soon after they hatch and are able to fly within a month.\nThey [migrate](https://bliptext.com/articles/bird-migration) to the southern [United States](https://bliptext.com/articles/united-states) and northern [South America](https://bliptext.com/articles/south-america).\nSora is a very rare vagrant to western [Europe](https://bliptext.com/articles/europe), where it can be confused with [spotted crake](https://bliptext.com/articles/spotted-crake).\nHowever, the latter species always has spotting on the breast.\na streaked crown stripe, and a different wing pattern.\nSoras forage while walking or swimming.\nThey are [omnivores](https://bliptext.com/articles/omnivore), eating [seeds](https://bliptext.com/articles/seed), [insects](https://bliptext.com/articles/insect) and [snails](https://bliptext.com/articles/snail).\nAlthough soras are more often heard than seen, they are sometimes seen walking near open water.\nThey are fairly common, despite a decrease in suitable habitat in recent times.\nThe call is a slow whistled ker-whee, or a descending whinny.\n\n# Taxonomy\nThe sora was [formally described](https://bliptext.com/articles/species-description) by the Swedish naturalist [Carl Linnaeus](https://bliptext.com/articles/carl-linnaeus) in 1758 in the [tenth edition](https://bliptext.com/articles/10th-edition-of-systema-naturae) of his [Systema Naturae](https://bliptext.com/articles/systema-naturae).\nHe placed it with the rails in the [genus](https://bliptext.com/articles/genus) [Rallus](https://bliptext.com/articles/rallus) and coined the [binomial name](https://bliptext.com/articles/binomial-name) [Rallus](https://bliptext.com/articles/rallus) carolinus.\nLinnaeus based his description on the \"little American water hen\" that [George Edwards](https://bliptext.com/articles/george-edwards-naturalist) had described and illustrated in 1750 from a specimen collected near the Hudson Bay.\nLinnaeus also cited [Mark Catesby](https://bliptext.com/articles/mark-catesby) who had described the \"soree\" in his The Natural History of Carolina, Florida and the Bahama Islands.\nThe sora is now placed in the genus [Porzana](https://bliptext.com/articles/porzana) that was erected in 1816 by the French ornithologist [Louis-Pierre Vieillot](https://bliptext.com/articles/louis-pierre-vieillot).\nThe genus name is derived from [Venetian](https://bliptext.com/articles/venice) terms for small rails, the specific epithet refers to the [Carolina Colony](https://bliptext.com/articles/carolina-colony).\nThe common name \"Sora\" is probably taken from a Native American language.\nThe species in [monotypic](https://bliptext.com/articles/monotypic): no [subspecies](https://bliptext.com/articles/subspecies) are recognised.\n\n# Description\nAdult soras are 19 - 30 cm long, with dark-marked brown upperparts, a blue-grey face and underparts, and black and white barring on the flanks.\nThey have a short thick yellow bill, with black markings on the face at the base of the bill and on the throat.\nSexes are similar, but young soras lack the black facial markings and have a whitish face and buff breast.\nThey weigh about 49 - 112 g and have a wingspan of 35–40 cm. Soras have two common calls: a loud, squeaking \"whinny\" that decelerates and descends in pitch, often used to advertise territories; and a softer, ascending \"ker-wee\" or \"sor-ah\".\nThe latter call is sometimes presented as a possible origin for the species' common name.\n\n# Distribution and habitat\nThe sora is common across North America, naturally occurring in 49 US states (the exception being Hawaii), all 10 Canadian provinces and 2 Canadian territories.\nOutside of US/Canada, the species is found throughout Central America, the Caribbean, and northern South America.\nThe species has been recorded as a [vagrant](https://bliptext.com/articles/vagrancy-biology) in [Iceland](https://bliptext.com/articles/iceland), [Great Britain](https://bliptext.com/articles/great-britain), [Portugal](https://bliptext.com/articles/portugal), and at [Lake Titicaca](https://bliptext.com/articles/lake-titicaca).\nSoras breed from Nova Scotia northwest to southern Yukon and Northwest Territories, south to California, Arizona, and New Mexico and northeast to Pennsylvania and New England.\nSora wintering grounds include the [Caribbean](https://bliptext.com/articles/caribbean), northern portions of South America, including Ecuador, Colombia, and Venezuela, north through Central America and Mexico to southern California in the West and coastal regions of the Southeast.\nFrom southern Kansas south to northern and eastern Texas and east through the inland areas of the southeastern United States, soras are typically only observed during migration in the spring and fall.\nIn a few areas of the western United States, including central California and areas of Arizona and New Mexico, soras may occur year-round.\nThe size of an individual Sora's home range varies.\nSora brood-rearing home ranges in northwestern Iowa averaged 0.5 acre.\nIn Arizona, sora home range size varied from 1.5 acre in the early breeding season to over 2 acre in the postbreeding season.\nThese seasonal differences in sora home range size were not significant (p>0.05).\nDensities vary from to 12 soras/acre in Colorado to 0.47 pair/ha in Indiana.\nAn average of 1.3 soras/ha responded to calls across sites in Colorado.\nA similar density of soras was found in southeastern Wisconsin.\nIn Iowa, average density over 2 years and several marsh habitats was 1.3 pairs/ha.\n≥Landscape factors, such as marsh area, habitat edges within marshes, and the number of marshes in a region may influence soras.\nAlthough soras occur in marshes of all sizes, they may occur at higher densities in intermediate-sized marshes.\nSoras were significantly (p≤0.01) positively related with total wetland area and perimeter area of surface water in east and central Maine and were significantly (p 0.05) different from random sites in northwestern Iowa.\nHeight of emergent vegetation in sora habitat also varies.\nIt ranged from 8 to 11 in in the spring after a winter disturbance in northwestern Iowa to 84 in in areas heavily used by soras in Arizona.\nIn marshes of western New York, average vegetation height at sora nesting sites was shorter than at random locations.\nHowever, the average height of emergent vegetation in sora territories in northeastern Iowa was not significantly (p>0.05) different from the height of vegetation in random plots.\nIn Arizona, both cover and height of vegetation used by soras varied with seasons.\nConway suggested the differences likely reflected the varied diet of the sora.\nThe availability of habitat in different seasons is another possible source of seasonal differences in sora habitat.\nExtent of woody vegetation surrounding South Dakota wetlands was not significantly (p=0.6) associated with sora occurrence.\nHowever, in marshes of western New York, there was a significant (p=0.041) negative relationship between percent flooded timber on a site and sora relative abundance.\nSoras may prefer some cover types.\nIn Arizona, 65.3% of sora use was in [southern cattail](https://bliptext.com/articles/southern-cattail) (Typha domingensis), although it accounted for only 16.5% of the vegetation.\n[Bulrushes](https://bliptext.com/articles/bulrushes) and a mixed-shrub community were also used more than their availability, while [saltcedar](https://bliptext.com/articles/saltcedar) (Tamarix chinensis) and [arrowweed](https://bliptext.com/articles/arrowweed) (Pluchea sericea) were avoided.\nA literature review notes sora avoidance of [purple loosestrife](https://bliptext.com/articles/purple-loosestrife) (Lythrum salicaria)-dominated sites.\nIn east and central Maine, wetlands used by soras had significantly (p=0.05) more ericaceous vegetation, such as [leatherleaves](https://bliptext.com/articles/leatherleaves) (Chamaedaphne spp.), [sweetgales](https://bliptext.com/articles/sweetgales) (Myrica spp.), and [laurels](https://bliptext.com/articles/laurels) (Kalmia spp.).\nIn marshes of northwestern Iowa, [broadleaf arrowhead](https://bliptext.com/articles/broadleaf-arrowhead) (Sagittaria latifolia) occurred in sora territories significantly (p<0.01) more often than at random sites.\nJohnson and Dinsmore imply that this likely results from both species preferring similar site conditions.\nIn May and June in Wisconsin, soras were detected significantly (p<0.025) more often in [cattail](https://bliptext.com/articles/cattail) (Typha spp.) survey areas than in sedge areas.\nHowever, in southeastern Wisconsin during the breeding season, there was no significant (p=0.943) difference in sora densities between habitats composed predominantly of cattail, sedge, or bulrush.\nIn addition, soras' use of [glaucous cattail](https://bliptext.com/articles/glaucous-cattail) (Typha × glauca), [broadfruit bur-reed](https://bliptext.com/articles/broadfruit-bur-reed) (Sparganium eurycarpum), [sedge](https://bliptext.com/articles/sedge), [river bulrush](https://bliptext.com/articles/river-bulrush) (Schoenoplectus fluviatilis), and [hardstem bulrush](https://bliptext.com/articles/hardstem-bulrush) (S. acutus var. acutus) habitats in marshes of northwestern Iowa generally reflected availability of these habitats.\nSeasonal differences in sora habitat use have been reported.\nIn northeastern Missouri in spring, the likelihood of detecting sora in robust emergents, such as cattail (Typha spp.) and [longroot smartweed](https://bliptext.com/articles/longroot-smartweed) (Polygonum amphibium var. emersum), was over 6 times that of detecting soras in these areas in fall.\nHowever, availability of habitats during various times of the year was not addressed.\nIn a study performed in southeastern Missouri, plant species used by sora during spring and fall migration differed significantly (p=0.005).\nHowever, the author qualifies this finding with his observation of major seasonal differences in vegetation availability.\nTemperature may also influence sora abundance.\nIn Colorado, average April temperature was significantly (p<0.01) negatively correlated (r= -0.94) with sora abundance.\nOn sites that had average April temperatures ≤ 42 F, soras were more abundant than the closely related [Virginia rail](https://bliptext.com/articles/virginia-rail) (Rallus limicola), while on warmer sites the sora to [Virginia rail](https://bliptext.com/articles/virginia-rail) ratio declined.\n\n## Migration\nThey [migrate](https://bliptext.com/articles/bird-migration) to the southern [United States](https://bliptext.com/articles/united-states), the [Caribbean](https://bliptext.com/articles/caribbean), and northern [South America](https://bliptext.com/articles/south-america).\nSora is a very rare vagrant to western [Europe](https://bliptext.com/articles/europe), where it can be confused with [spotted crake](https://bliptext.com/articles/spotted-crake).\nHowever, the latter species always has spotting on the breast.\na streaked crown stripe, and a different wing pattern.\nSoras forage while walking or swimming.\nThey are [omnivores](https://bliptext.com/articles/omnivore), eating [seeds](https://bliptext.com/articles/seed), [insects](https://bliptext.com/articles/insect) and [snails](https://bliptext.com/articles/snail).\nAlthough soras are more often heard than seen, they are sometimes seen walking near open water.\nThey are fairly common, despite a decrease in suitable habitat in recent times.\nThe call is a slow whistled ker-whee, or a descending whinny.\nThe use of call broadcasts greatly increases the chances of hearing a sora.\nCall broadcasts can also increase the chances of seeing a sora, as they will often investigate the source of the call.\nSora's northern migration occurs in spring, primarily in April and May.\nFor instance, in east-central Kansas significantly (p<0.05) more soras were detected from 24 April to 7 May than the 2-week periods before or after.\nIn southeast Missouri, soras were observed from 25 March to 6 May.\nSoras were first detected in April to early May in Colorado, Iowa, and Minnesota.\nIn a summary of the first detections of soras in Minnesota, Manitoba, and Saskatchewan, all occurred in April.\nSoras depart their breeding grounds as early as July and as late as October.\nSoras were observed returning to wintering grounds in Arizona as early as late July.\nAlthough local movements may obscure migration occurring in July, most migration occurred in August and September in Colorado.\nIn northern Ohio, sora abundance was increased in late August and September by migrating individuals.\nIn southeastern Missouri, soras were observed from 5 September to 27 October.\nSoras have been observed in Manitoba and Saskatchewan as late as October.\n\n# Behavior and ecology\n\n## Breeding\nAlthough sora nesting activities have been observed from late April through early August, the peak nesting period typically occurs from May to early July.\nIn New York, nesting was initiated in late April.\nA nest search and literature review study of soras in Colorado reports a clutch initiated in early August.\nHowever, mean clutch initiation dates occurred in May and June in regions across the state.\nStudies from northern Ohio, North Dakota, and Alberta report nesting from May to July.\nIn a review, sora nests with eggs were recorded from early May to early July in Indiana.\nThe sora's breeding habitat is [marshes](https://bliptext.com/articles/marsh) throughout much of [North America](https://bliptext.com/articles/north-america).\nThey nest in a well-concealed location in dense vegetation.\nThe female usually lays 10 to 12 [eggs](https://bliptext.com/articles/egg-biology), sometimes as many as 18, in a cup built from marsh vegetation.\nThe eggs do not all hatch together.\nBoth parents [incubate](https://bliptext.com/articles/incubate-bird) and feed the young, who leave the nest soon after they hatch and are able to fly within a month.\nSora females begin construction of saucer-shaped nests on the ground or on a platform over shallow water at the start of egg laying.\n[Clutch sizes](https://bliptext.com/articles/avian-clutch-size) typically range from 8 to 13 eggs, although clutch sizes of up to 16 have been reported.\nBoth parents incubate the eggs.\nIncubation lasts approximately 19 days, although a wide range of incubation periods has been reported in the literature.\nEggs hatch over a span of 2 to 13 days.\nNestlings are precocial and are capable of walking and swimming short distances (< 3 ft) by the end of their first day.\nYoung soras are independent by about 4 weeks of age.\nSoras brood once per season.\nSome late broods may be second nesting attempts, but there is only one report in the literature of a second brood attempt after a successful nest.\nFor information on breeding behavior of soras, see.\nFor information on conspecific nest parasitism and egg discrimination in soras see.\nSora nest success rates vary across locations and years.\nIn the literature addressing sora apparent nest success, the proportions of successful nests varied from 0.61 in Michigan to 0.833 in Minnesota.\nIn western New York, the nest success rate of 6 sora nests was 0.43, and the daily nest success rate was 0.97.\nUsing data from the Cornell Laboratory of Ornithology's nest record program, nesting success rate of soras in North America was estimated as 0.529 over a 28-day period (n=108).\nOn a site in Alberta, 80.6% of eggs successfully hatched, while the following year only 59.6% of eggs hatched.\nThe authors conclude that diminished water level interacting with predators and trampling by cattle resulted in decreased hatching success.\nDuring late summer, soras are flightless for a period during their post-nuptial molt.\n\n## Food and feeding\nSoras eat a wide range of foods.\nAnimals that are commonly reported as sora food items include [snails](https://bliptext.com/articles/snails) (Gastropoda), [crustaceans](https://bliptext.com/articles/crustaceans) (Crustacea), [spiders](https://bliptext.com/articles/spiders) (Araneae), and [insects](https://bliptext.com/articles/insects) (Insecta), mainly [beetles](https://bliptext.com/articles/beetles) (Coleoptera), [grasshoppers](https://bliptext.com/articles/grasshopper) (Orthoptera), [flies](https://bliptext.com/articles/flies) (Diptera), and dragon[flies](https://bliptext.com/articles/flies) (Odonata).\nSoras often eat the seeds of plants, such as [smartweeds](https://bliptext.com/articles/smartweeds), [bulrushes](https://bliptext.com/articles/bulrushes), [sedges](https://bliptext.com/articles/sedges), and [barnyard grasses](https://bliptext.com/articles/barnyard-grasses).\nSeeds of annual [wildrice](https://bliptext.com/articles/zizania-aquatica) (Zizania aquatica) and [rice cutgrass](https://bliptext.com/articles/rice-cutgrass) are eaten by soras in the eastern United States.\nA literature review lists [crowngrass](https://bliptext.com/articles/paspalum) (Paspalum spp.) and [rice](https://bliptext.com/articles/oryza-sativa) (Oryza sativa) as relatively important food sources for soras in the Southeast.\nPlants composing less than 5% of the sora's diet are also listed and include [spikerushes](https://bliptext.com/articles/eleocharis) (Eleocharis spp.), [duckweeds](https://bliptext.com/articles/duckweeds) (Lemnaceae), [pondweeds](https://bliptext.com/articles/potamogeton) (Potamogeton spp.), [panicgrasses](https://bliptext.com/articles/panicum) (Panicum spp.), [cordgrasses](https://bliptext.com/articles/spartina) (Spartina spp.), and [saltgrass](https://bliptext.com/articles/distichlis-spicata) (Distichlis spicata).\nSoras eat more plant food in fall and winter (68%–69%) than in spring and summer (40%).\nPlant material such as [hairy crabgrass](https://bliptext.com/articles/digitaria-sanguinalis) (Digitaria sanguinalis), [fall panicgrass](https://bliptext.com/articles/panicum-dichotomiflorum) (Panicum dichotomiflorum), and [bristlegrass](https://bliptext.com/articles/setaria) (Setaria spp.) occurred at substantially higher frequencies and in much larger volumes in sora esophagi collected in southeastern Missouri during fall migration than those collected in spring.\nIn addition, animals were a larger volume of the spring diet than the fall diet.\nThe volume of animal material in esophagi collected in spring was predominantly composed of adult beetles and snails from the [Physidae](https://bliptext.com/articles/physidae) family.\n# [Sora foraging in water | upload.wikimedia.org/wikipedia/commons/8/82/Porzana///carolina.jpg]\n\n## Survival\nFew data are available on the survival of soras.\nRadio-marked soras in Arizona had a nonbreeding survival probability of 0.308.\nThe authors suggest the low survival rate may be due to increased mortality of radio-marked birds.\nLikely causes of mortality are predation and human-caused sources such as road kill.\nSora eggs are eaten by several species including [American minks](https://bliptext.com/articles/mustela-vison) (Neogale vison), [skunks](https://bliptext.com/articles/mephitidae) (Mephitidae), [coyotes](https://bliptext.com/articles/canis-latrans) (Canis latrans), [grackles](https://bliptext.com/articles/quiscalus) (Quiscalus spp.), [crows](https://bliptext.com/articles/corvus-genus) (Corvus spp.), and [herons](https://bliptext.com/articles/ardeidae) (Ardeidae).\nPredation of adult soras by American minks, coyotes, and [hawks and owls](https://bliptext.com/articles/birds-of-prey) have been reported.","revisionCount":0},"hasMore":false,"nextCursor":null}