A Cannibal Immigrant: The Cuban Tree Frog (Osteopilus septentrionalis)

These little things are actually the largest tree frogs in North America. They are known for their voracious appetite making their diet almost anything they can fit in their mouths. Their diet includes mainly insects, but adults frogs are known to consume other frogs, small lizards, snakes, young mice, and hatchling birds. A very balanced carnivorous diet if you ask me. This fact sheet from SeaWolrd has some good information on this species of amphibian.