A very large animal with thick grey skin, large ears, two curved outer teeth called tusks and a long nose called a trunk. There are two types of elephant, the African and the Asian.
An animal with long legs, that eats grass, leaves, etc. and can run fast. Most male deer have antlers (= horns shaped like branches). There are many types of deer.
An African or Asian animal like a deer, that runs very fast. There are many types of antelope. An antelope is a member of a number of even-toed ungulate species indigenous to various regions in Africa and Eurasia.