There are millions of different types of living things on Earth. In order to keep track of them all, scientists put living things into groups based on characteristics that they have that are the same.

Crustaceans, a small but mighty animal classification group of invertebrates, can be found scuttling across the ocean floor, scavenging for their next snack. Lobster, shrimp, crab, and crayfish, all ...

With approximately 11,000 species, birds are one of the most diverse animal classification groups characterized by their feathered appearance and migratory behaviors. From trilling canaries to ...