Of all the animals alive on earth today, amphibians are the most endangered--and countless amphibian species have succumbed to disease, disruption of the food chain, and devastation of their natural habitats.

You might think lions, tigers and cheetahs would be better equipped to defend themselves against extinction than less dangerous animals--but you'd be dead wrong. The fact is that, for the last million years, big cats and human beings have a poor track record for coexistence, and it's always people who come out on top.