Animal planet

In this slideshow, you'll discover the six main animal groups, ranging from the simplest (invertebrates) to the most complex (mammals).

This Encyclopedia Britannica animals list refreshes your knowledge of 5 groups of vertebrates in biology.

In order for us to understand how all living organisms are related, they are arranged into different groups. The more features that a group of animals share, the more specific the group is. Animals are given scientific names so that people all around the world...