New frog species is armed with special skin-puncturing claw. The "extraordinary" Ecuadorian amphibian may use the special body part to flay and stab predators—and even fellow frogs.

The world's smallest known frog—and vertebrate—is a housefly-size frog that’s about 7.7 millimeters long. An adult male Mini mum , one of the world’s smallest frogs, rests on a fingernail ...