Red-eyed Tree Frog Agalychnis callidryas The red-eyed tree frog has a third eye lid called the nictitating membrane that shields its eyes from danger while allowing it to see.

Giant Monkey Frog Phyllomedusa bicolor The giant monkey frog tolerates direct sunlight by spreading around a natural "sunscreen" secreted by a gland on its neck.

Tiger-Striped Monkey Frog Phyllomedusa tomopterna The tiger-striped monkey frog can open its legs suddenly, revealing an orange and black underbelly that startles predators.

Panamanian Golden Frog Atelopus zeteki Golden frogs use a form of sign language to signal one another. They "wave" their hands to attract a mate or scare off a rival.

Darwin's Frog Rhinoderma darwinii Darwin males ingest eggs into their vocal sac and spit out baby frogs once they have undergone metamorphosis.

Strawberry Poison-dart Frog Oophaga pumilio Females deposit individual tadpoles into pools of water that collect at the base of bromeliad plants. They feed unfertilized eggs to this brood of growing tadpoles until they reach maturity.

Phantasmal Poison Frog Epipedobates tricolor This amphibian apparition produces a toxin that includes the molecule epibatidine, a painkiller.

Golden Poison Frog Phyllobates terribilis The skin of this black-mouthed frog contains enough poison to kill ten humans.

Wood Frog Lithobates sylvaticus The wood frog can survive sustained temperatures as low -6 Celsius -- cold enough to actually freeze.