It is found in the Neotropics and the Nearctic. Roof rats may have black, gray, or brown fur, and a long The pack rat, also called a wood rat, is most common in central Arizona desert areas. ... Arizona Participant Group San Diego County Water Authority . The cotton rat, or Sigmodon, is a small rodent whose scientific name means simply “five teeth.” This seems to be fairly disrespectful to this interesting creature, who has far more going for it than to be named after its limited dental spectrum. In California, found in isolated sections of marshy and grassy areas adjacent to the Colorado River. Bicolored, lighter below. Colorado River Cotton Rat (Sigmodon arizonae plenus) (CRCR) Basic Conceptual Ecological Model for the Lower Colorado River . Cotton rats are agricultural pests, and rarely found in the built environment. Individuals can grow to 198 g. Reproduction is dioecious. Lower Colorado River Multi-Species Conservation Program . Sigmodon arizonae arizonae, Camp Verde Arizona cotton rat; Sigmodon arizonae jacksoni, Yavapai Arizona cotton rat; Sigmodon hispidus eremicus, Yuma hispid cotton rat; Sigmodon ochrognathus, Yellow-nosed cotton rat; Sorex arizonae, Arizona shrew; Sorex palustris, Water shrew; Spermophilus tridecemlineatus monticola, White Mountains ground squirrel Photo courtesy of Nick Rice. Unlike many types of rat, the pack rat has fur covering its tail. About as long as head and body combined, 5-8 inches. Sigmodon arizonae (Arizona Cotton Rat) is a species of rodents in the family cricetids . Current monitoring efforts are guided by the protocol developed for small nocturnal mammals by … Ranging from central Arizona in the The Arizona cotton rat has a typical rat-like appearance, and is sufficiently similar to the hispid cotton rat that it was considered to be part of the same species until 1970, when genetic analysis confirmed its distinct nature. Cotton Rat Facts. It has bristly brownish fur over most of its body, with whitish underparts and grey feet. the Arizona cotton rat (Sigmodon arizonae), on the monument for the first time in December 1988, and recorded Merriam’s mouse (Peromyscus merriami) monument for the first time since 1894. Identification. Arizona Cotton Rat is a solitary invertivore. Central Arizona houses three main types of pack rat: the Mexican pack rat, Whitethroat pack rat, and Stephen’s pack rat. It is associated with freshwater habitat. Cotton Rat Scientific Name: Sigmodon. The Cotton Rat (Sigmodon hispidus), found in the southeastern US and down into Central and South America, has a bigger body than the deer mouse.The head and body measure approximately 5 – 7 inches (12.5cm – 18cm), with another 3 – 4 inches (7.5cm – 10cm) for the tail. Bicolored, lighter below. S. arizonae is a large species of cotton rat with brownish black dorsal pelage and silvery or whitish underparts. 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