| The Catalina Deermouse may or may not still exist in its only known locality, Catalina Island off Baja California Sur. In 1931, these large deermice were abundant and even seen running around in the daytime. In the 1990s, only nineteen were trapped, and they were later re-identified as Peromyscus eremicus, a species that competes with P. slevini. P. eremicus was not known to live on Catalina Island, and may have come with fishermen.
Total Length: 210, 214 mm; Tail vertebrae: 97, 109 mm
Mailliard, 1924. Proceedings of the California Academy of Sciences, ser. 4, 12:1221.
Mammal Species of the World (opens in a new window).