It is a unique type of animal in the order Artiodactyla, known for its long neck and high height. It can only feed on leaves as its main food, has a longer tongue, has short horns on its head, and the horns are covered with hairy skin. Currently only distributed in Africa, there are two species, while prehistoric distribution is more widespread. Evolution began with deer animals in the early Miocene and went through multiple stages of evolution. Adapted to life in the savanna, with longer necks and limbs to obtain leaves. Not only is it the tallest extant terrestrial animal, but it is also one of the representative animals in the African savanna region. Long necks and legs not only help them forage, but also serve as a "cooling tower" for them to adapt to hot environments.