A small insect that lives in highly organized groups. There are many types of ant. Ants have colonised almost every landmass on Earth. The only places lacking indigenous ants are Antarctica and a few remote or inhospitable islands.
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.