How to Tell Similar-looking Animals from One Another? There are approximately 7.7 million species of animals on our planet. With such an abundance of life forms, it's not surprising that people tend to confuse certain animals. This informative video by Brightside will teach you how to tell even the most similar looking animals from one another. You'll never make the old mistakes again and will be able to easily find the difference between crocodiles and alligators, llamas and alpacas, leopards and jaguars and many other creatures.