Classification allows us to group animals together depending on their similarities and differences. Animals are divided into two main groups: Animals with a backbone are called vertebrates.

Animals are divided into two main groups. Animals that have a backbone are called vertebrates. Animals that don't have a backbone are called invertebrates. Vertebrates and invertebrates are ...

From scales to feathers to fur, vertebrates clothe themselves in a ... of Geneva biologist Michel Milinkovitch visited an Italian animal fair, found scaleless, “naked” bearded dragons for ...