HARE definition: 1. an animal like a large rabbit that can run very fast and has long ears 2. to run or go very…. Learn more. Hare or rabbit? The black-tailed jackrabbit (Lepus californicus) at left is a hare , and the desert cottontail (Sylvilagus audubonii) at right is a rabbit. (more) Learn about hares, small, fast-running mammals with long ears and legs, big hind paws, and short bushy tail. Find out how hares differ from rabbits, where they live, what they eat, and how they reproduce. Hare is the common name for small, fast-running mammals in the genus Lepus of the family Leporidae and order Lagormopha, characterized by long ears and legs, large hind feet, a short and bushy tail, and young born with fur and with eyes open. All other members of Leporidae are known as rabbits and are distinguished from the hares generally by shorter ears and smaller size, and by the young being born without fur and with eyes closed (Angerbjörn 2004). Also included in the Lagomorphs are the ...