In the Cotton rat the adult worms cause local haemorrhages.

The molars of cotton rats are S-shaped when viewed from above.

In the far south, the rabbits and hare are sometimes replaced by cotton rats as the primary food source.

In Texas male hispid cotton rats also had larger home ranges than females.

A cotton rat is any member of the rodent genus Sigmodon.

It does not usually make its own runways in vegetation, but may use those of other rodents, such as cotton rats.

Preferred prey species can include voles, cotton rats and ground squirrels.

Hispid cotton rats have been noted as one of the most prolific mammals in the Southeast.

The mean hispid cotton rat population density range for all studies was 5.3 to 31.1 rats per hectare.

Sand pine scrub has little ground cover and is marginal habitat for hispid cotton rats.

Some studies have suggested that hispid cotton rats are mainly nocturnal, but activity has been observed at all hours.

Mammalian predators did not have a substantial effect on hispid cotton rat population density.

Gestation in hispid cotton rats lasts approximately 27 days.

Male hispid cotton rats exhibit a lower degree of habitat selectivity than females.

Hispid cotton rats occur in grassy areas or early-successional habitats within open woods.

In this country, the virus is carried by deer mice, white-footed mice and cotton rats.

In Georgia, a density of 15 hispid cotton rats per acre was considered the predator-limited carrying capacity.

Habitat use and preference by hispid cotton rats usually appears to depend on the density of monocots.

For example, hispid cotton rats may respond favorably to a high percentage of dicots in a stand if cover remains optimal.

Cameron and McClure compiled reports of hispid cotton rat population densities.

Main rodent host is the Cotton Rat.

The cotton rat is mainly active during the day, which may help differentiate its niche from that of the rice rat.

Hispid cotton rats are active year-round.

Populations in the northern part of hispid cotton rat range experience dramatic declines in the nonbreeding season.

Hispid cotton rats occupy a wide variety of habitats within their range but are not randomly distributed among microhabitats.

A cotton rat is any member of the rodent genus Sigmodon.

Phyllotini all have very large sphenopalatine vacuities, as does Sigmodon.

Molecular systematics and phylogeography of the Sigmodon hispidus species group.

Relative width of the zygomatic plate can distinguish some species of Sigmodon.

The genus Sigmodon, which is classified in its own tribe, has a broad zygomatic plate and a zygomatic spine.

The amount of variation was similar to findings in examinations of Peromyscus polionotus, Sigmodon, and Dipodomys.

Among the rodents killed by the American mink in its native range are rats and mice of the genera Hesperomys, Microtus, Sigmodon, and Neotoma.

The genera Wiedomys and Sigmodon are generally placed in their own tribe, and the "phyllotines" Irenomys, Punomys, Euneomys, and Reithrodon are considered incertae sedis.

In order to determine the relationships of his new species, Steppan carried out a cladistic analysis, in which he also included the oryzomyines Holochilus, Lundomys, Pseudoryzomys, and Cerradomys, as well as the non-oryzomyine Sigmodon.

Hershkovitz identified Holochilus as one of the members of a "sigmodont" group of American rodents, also including Sigmodon, Reithrodon, and Neotomys, on the basis of its flat-crowned molars, which are lophodont (the crown consists of transverse ridges).

Playa de Oro virus was identified as a new species in 2008 and is most closely related to Bayou virus, Catacamas virus, Muleshoe virus, and Black Creek Canal virus, found in other species of Oryzomys and Sigmodon.

Similarly aged fossil sites are also known from the nearby islands of Curaçao and Aruba, but these contain various other rodents, including Megalomys curazensis and Dushimys larsi on Curaçao and species of Oligoryzomys, Sigmodon, and Zygodontomys on Aruba.