Cameron and McClure compiled reports of hispid cotton rat population densities. It is also known as the Ecuadorian cotton rat. Rodents are the normal definitive hosts, especially the Cotton Rat. In the Cotton Rat the adult worms cause local haemorrhages. A cotton rat is any member of the rodent genus Sigmodon. The Mexican cotton rat belongs to the Family Cricetidae in the Order Rodentia. The Toltec cotton rat ("Sigmodon toltecus") is a rodent species in the family Cricetidae. Hispid cotton rat and cotton mouse are considered important reservoir hosts of Everglades virus. The Mexican cotton rat coexists cooperatively with other similar rodents in the ecosystem. The yellow-nosed cotton rat ("Sigmodon ochrognathus") often shares its burrow. Alston's cotton rat ("Sigmodon alstoni") is a rodent species from South America. The southern cotton rat ("Sigmodon hirsutus") is a rodent species in the family Cricetidae. The montane cotton rat ("Sigmodon zanjonensis") is a rodent species in the family Cricetidae. Allen's cotton rat ("Sigmodon alleni") is a species of rodent in the family Cricetidae. The unexpected cotton rat ("Sigmodon inopinatus") is a species of rodent in the family Cricetidae.