1) Family antilocapridae 2) Mammal family 
The Antilocapridae are a family of artiodactyls endemic to North America. Their closest extant relatives are the giraffids with which they comprise the superfamily Giraffoidea. Only one species, the pronghorn (Antilocapra americana), is living today; all other members of the family are extinct. The living pronghorn is a small ruminant mammal resem...
[n] - comprising only the pronghorns
family Antilocapridae noun comprising only the pronghorns