The antelope are a group of herbivorous African animals of the family Bovidae, distinguished by a pair of hollow horns on their heads. These animals are spread relatively evenly throughout the various subfamilies of Bovidae and many are more closely related to cows or goats than each other. There are many different species of antelope, ranging in size from tiny to very big. They typically have a light and elegant figure, slender, graceful limbs, small cloven hoofs, and a short tail. Antelope have powerful hindquarters and when startled they run with a peculiar bounding stride that makes them look as though they are bouncing over the terrain like a giant rabbit. Some species of antelope can reach speeds of 60 miles per hour (100 kilometers per hour), making them among the fastest of land animals.