Aug 05, 2014 09:47 AM EDT
How Amphibians Crossed Continents: New Evidence that Frogs Swam Across Oceans
Amphibians can be found all across the planet--on six continents and in almost every type of ecosystem. Now, researchers have taken a look at the more than 7,000 known species of amphibians to find out why they can be found all over the world.