15) The first amphibians emerge onto land

Agalychnis callidryas, the Red-Eyed Tree Frog is native to the Neotropical rain forests of Central America. Image credit: © Tenzin Alex Anderson.

395 million years ago – The first amphibian animals hop and lumber onto land, trading in their gill slits for air-breathing lungs, transforming fins into stubby legs and continuing to return to the water to lay their eggs. The ancestors of frogs and toads!