The giraffe is the tallest terrestrial animal living today and may reach heights of nineteen feet. The horns of giraffe are the most unusual horns of any mammal. They are two, some times three, bumpy hair covered knobs that grow slowly throughout the animals life. Okapis appear to be a cross between a giraffe and a zebra in that they the small horns of a giraffe and horizontal white stripes on the posterior similar to a zebra. Animals in the order Artiodactyla are known as the even toed animals.
Artiodactyls are sometimes called cloven hooved, that is they have two toes.
Artiodactyla skulls come in many shapes and forms. Those found in Old World pigs are large and massive with large upper canines that grow outward and backwards forming tusks. The skull of the New World equivalent of a pig, the peccary, is small and more delicate. Its canines grow downward and meet with the lower canines to form precision scissors. Animals of the order Artiodactyla may have antlers or horns.