Black-tailed prairie dog
 The black-tailed prairie dog (Cynomys ludovicianus) is a rodent of the family Sciuridae found in the Great Plains of North America from about the USA-Canada border to the USA-Mexico border. Unlike some other prairie dogs these animals do not truly hibernate. The black-tailed prairie dog can be seen above ground in midwinter. A black-tailed prairie dog town in Texas was reported to cover 64000 km2 (25000 sq mi) and included 400000000 individuals.