Prairie dog and Clark in 1804. Lewis described it in more detail in 1806, calling it the "barking squirrel". On average, these stout-bodied rodents will grow to be between long, including the short tail, and weigh between . Sexual dimorphism in body mass in the prairie dog varies 105 to 136% between the sexes. Among the species, black-tailed prairie dogs tend to be the least sexually dimorphic, and white-tailed prairie dogs tend to be the most sexually dimorphic. Sexual dimorphism peaks during weaning, when the females lose weight and the males start eating more, and is at its lowest when the females
Gunnison's prairie dog to five years in the wild, but they can live up to eight years of age. The population of the Gunnison's prairie dog is declining drastically due to three major factors: shootings, plague cycles, and poisoning. Many concerned groups of people are requesting that the Gunnison's Prairie Dog be listed under the federal Endangered Species Act. Predators include badgers, wolves, coyotes, bobcats, black-footed ferrets, weasels, golden eagles and large hawks. Humans also affect prairie dog populations; for example, some ranchers implement poisoning programs to eliminate them. Plague (disease), caused by "Yersinia pestis" and transmitted via fleas, can wipe out numerous