What is an animal? Sounds simple enough, but what exactly is an animal? For one, they must be multicelluar. These cells make up tissues which in turn, make up organs, then organ systems. Animals are found all over the world on every continent. FUN FACT, there are some penguins the live in South America due to the fact that they can swim the distance from Antarctica to South America.Animals are important not only to the environment by helping out with the nitrogen cycle, but they provide us with food to eat. Animals are all Heteotrops and are made up of Eukaryotic cells. Animals are Eukaryotes and are Heterotropic.