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 other prairie dogs to nearby danger. It can last for up to 30 minutes and can be heard nearly a mile away. As danger approaches, the intensity of the signal increases, and it ends after the prairie dog has entered its safe haven. Studies have also shown prairie dogs can distinguish between the different colors of clothing people wear, and between people expressing threatening and nonthreatening behavior. The Gunnison's prairie dog mating season begins in mid-March and lasts until mid-May. A female is able to reproduce at the age of one year. When food availability is scarce during the mating