Gallery: Frogs Are Really Cool. Too Bad Humans Are Killing Them All
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The red-backed poison frog from the Amazon makes it clear it isn't to be trifled with.
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The splendid leaf frog uses its massive feet to glide from tree to tree.
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True to its name, the imitating poison frog mimics another poison frog.
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Europe's green toad produces an "evil-smelling white secretion" from its skin when disturbed.
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Male yellow heart-tongued frogs use a pair of sharp tusks to wound their rivals.
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This magnificent Borneo horned frog is one hell of an eater, taking down lizards, crabs, scorpions, and even small rodents.
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Peru's sky blue poison dart frog is in serious trouble due to habitat loss.
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Male Borneo tree-hole frogs belt out a call that females can hear 160 feet away.
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You might find adult, juvenile, and tadpole Malagasy climbing rain frogs all in one water-filled tree hole, suggesting that adults care for their young.