Zebras are mammals. Which means they have mammary gland which produce milk to feed their young, They also have hair, three bones in their ears and a four chamber heart. One of the biggest indicators of a mammal is that they are warm-blooded. What does it mean to be warm-blooded? These animals maintain a relatively high body temperature. They do this with their metabolism, when the body breaks down cells, it produces energy and heat. In a cold-blooded animal, this heat would be lost and would leave the animal. In a warm-blooded animal though, this heat is stored and used to keep the body temperature high and consistent.