Do you know how Impalas recognize each other? They have three black lines, unique to each, at the end of the ears, on the back of the tail, the upper thighs and on the forehead. They are even called "111" in Kenya by the trackers because of these 3 visible black lines. Impalas belong to the family Bovidae, more precisely antelopes, they resemble gazelles and deer. They measure generally from 4 to 5 feet in length, and are found mainly in eastern central and southern Africa.