Pemberton's deer mouse
Pemberton's deer mouse (Peromyscus pembertoni) lived on San Pedro Nolasco Island (27°58′03″N 111°22′42″W / 27.96749°N 111.37845°W / 27.96749; -111.37845) in the Gulf of California.The upper parts of the pelage are medium brown; the sides are lighter brown with a broad orange lateral line extending from the cheek to the hindquarters; the under parts are whitish, the ankles dusky gray, and the feet whitish below ankle.The only island that supported two different species of Peromyscus - P. pembertoni and P. boylii - was San Pedro Nolasco.Breeding probably occurred throughout most of the year, although the majority of young would have been born in spring and early summer.Like other Peromyscus species, they probably had keen eyesight and vision, and used chemical cues extensively in communication.