Let the World Tremble

With all the things we hear nowadays about Asian species coming into our country and unbalancing our ecosystems, it's nice to know that America can still give as good as it gets. Take the humble bullfrog, for example. They've conquered our continent, and now they're moving on Canada, France, Venezuela, and beyond.

Why are bullfrogs so tough? Well, the ability to lay 10x more eggs than competing species helps. But I'm guessing it also has to do with all the intramural battles they fight:

"Studies of bullfrog intestines reveal the amphibians eat just about anything they can fit into their mouths: birds, rats, snakes, lizards, turtles, fish, other frogs, and especially each other. In southern Arizona the most common vertebrates found in bullfrogs are other bullfrogs..."