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Zacatecan deer mouse
The Zacatecan deer mouse, or southern rock deermouse (''Peromyscus difficilis'') is a species of rodent in the family Cricetidae.〔Musser, G. G. and M. D. Carleton. 2005. Superfamily Muroidea. Pp. 894-1531 ''in'' Mammal Species of the World a Taxonomic and Geographic Reference. D. E. Wilson and D. M. Reeder eds. Johns Hopkins University Press, Baltimore.〕 It is found only in Mexico, and is not considered endangered.〔
==Description==
Zacetecan deer mice are medium-sized mouse-like animals, weighing from , with long tails, large ears, and a slightly elongated snout. They have a combined head and body length of , but the tail is always always somewhat longer than the body, being from long. The female has six teats.
The upper part and flanks of the animal are typically ochraceous or buff, but in some subspecies may be brownish-red or have a heavy overlay of darker hairs that render the animal almost blackish in color. A clearly visible line runs along the flanks, while the underparts are generally paler, being whitish or pale grey. The area around the shoulders often bears a patch of fur with a slightly ochre or salmon color. There is also a narrow ring of darker fur around the eyes, emphasising their appearance. The tail has a similar color to the body, being buff or ochre above, and paler on the underside.〔
Zacetecan deer mice breed during the wetter parts of the year, from June to December. The female can produce up to three litters in a season with an average of three pups each. Females can reach sexual maturity within six months, so that some born in the early part of the breeding season may produce youg of their own before the end of the year.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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