White-ankled mouse
species of mammal
The white-ankled mouse (Peromyscus pectoralis) is a species of rodent in the family Cricetidae. It is a species of the genus Peromyscus, a closely related group of New World mice often called "deermice". It is found in Mexico, and in New Mexico, Oklahoma and Texas in the United States.
The white-ankled mouse is commonly found in coexistence with the brush mouse and Texas mouse (P. boylii and P. attaweri, respectively). Often, the sympatric overlap in characteristics between these species makes it difficult to identify a specific species. The most distinguishing feature of the white-ankled mouse, and the one most used to identify the species, is the baculum of males. The tip of the white-ankled mouse's baculum is long and cartilaginous, whereas the tips of brush and Texas mice are short and rounded.
Description
White-ankled mice have three distinct pelages in their life cycles: juvenile, subadult, and adult. Two molt phases (post-juvenile and post-subadult) are necessary for the distinct pelages in each phase of their lives.
In Texas, the white-ankled mouse differs from the Texas mouse by having shorter hind feet, white ankles, paler color, and a more defined bicolor tail.
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