AnimalsThere are over a million different animals. Some are very large, like the whale and others, like insects, are very small, here you will find hundreds of free online puzzles to have fun and learn how they are. Animals are divided into two main groups: vertebrates and invertebrates. Vertebrate animals are those that have skeletons. The skeleton is formed by the bones that support and shape the body. There are five types: mammals, birds, fish, reptiles and amphibians. For example, horses, rabbits, elephants, fish, frogs, birds, felines, cats, dogs, etc. Invertebrates are those that have no skeleton. Many have a soft body, like worms; some have a shell that protects their bodies, like snails, and others have a shell, like crabs. Also animals and missing people like dinosaurs.