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Rodentia Muridae Sigmodon, World Distribution Table - English
URL: http://www.press.jhu.edu/books/walkers_mammals_of_the_world/tables/table.genus.r

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Sigmodon: Cotton Rats - English
URL: http://www.press.jhu.edu/books/walkers_mammals_of_the_world/rodentia.muridae.sig

Cotton rats prefer grassy and shrubby areas. Their presence is indicated by surface trails, shallow burrows beneath small plants, and small nests of grasses and sedges located in cuplike depressions in the ground. At the northern extremity of the range of S. hispidus, in Nebraska, nests were found 76.2 cm below the surface in the burrows of other animals (Baar, Fleharty, and Artman 1975). Cotton rats are active day and night throughout the year.

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Sigmodon hispidus (Hispid Cotton Rat): Narrative - English
URL: http://animaldiversity.ummz.umich.edu/accounts/sigmodon/s._hispidus.html

Hispid cotton rats exist in a wide range of habitats. However, the presence of grassy patches with some overstory of shrubbery seems to be a requirement.

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Sigmodon hispidus - English
URL: http://www.fs.fed.us/database/feis/animals/mammal/sihi/

Wildlife Distribution and Occurrence. Biological Data and Habitat Requirements. Fire Effects and Use.

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Yellow-nosed Cotton Rat (Sigmodon ochrognathus) - English
URL: http://www.nsrl.ttu.edu/tmot1/sigmochr.htm

Yellow-nosed cotton rats live primarily on rocky slopes with scattered bunches of grass. In the Chisos Mountains their runways have been located in lodged needle grass in Laguna Meadow at the foot of Emory Peak. There, the rats occupied an area of about 40 ha.

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Hispid Cotton Rat (Sigmodon hispidus) - English
URL: http://www.nsrl.ttu.edu/tmot1/sigmhisp.htm

Normally this rat inhabits tall-grass areas where such grasses as bluestem (Andropogon), cordgrass (Spartina), or sedges (Carex) offer both freedom of movement under a protective canopy and an adequate food supply.

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