| Anthony’s Woodrat is either extinct or very close to extinction. It lived (or lives) only on two small islands off Baja California, islands that were connected to the mainland less than 20,000 years ago. In 1922, scientists on the islands found the woodrats to be "extremely numerous," but by 1989, they found no nests and no feces. All they found was one skull. The islands used to provide good habitat for woodrats, which typically eat plant matter and build nests that are used by generation after generation, but cats, brought to the islands by fishermen, seem to have done them in. The only other terrestrial mammal native to the islands, the North American Deermouse, was also prevalent in 1922 and absent by the end of the 20th century. Anthony's Woodrats were medium-sized, with grayish-brown fur on their backs and short, hairy tails. They were somewhat larger than very similar woodrats that live on the mainland, and males were somewhat larger than females.
Males are larger than females
Total Length: 320.6 mm males; 316.8 mm, females. Head and body: 182.8 mm, males; 177.1 mm, females T
221 g males; 169.8 g females
Allen, J.A, 1898. Bulletin of the American Museum of Natural History, 10:151.
Mammal Species of the World