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
Residence card of a family member of a Union citizen of residence, it does not create it. Even without applying for a Residence Card, a qualifying family member has the right of residence, although it may be difficult to prove. As of 6 April 2015, the non-EU family members of an EU national who are in possession of a residence card, which is issued to them under article 10 of directive 2004/38, are entitled to enter the UK without the need to apply for an EEA Family Permit, only by providing their passport and residence card at the border. However, the UK border officers may request proof of their relation