Although they cannot be sure, scientists believe that more than half the world's species, from bacteria to big mammals and trees, live in the rain forests.

It seems they're still the only big mammal unaffected by the radiation.

This planet, which had never known the hunter's hand, abounded in big mammals.

It clings to one of the big mammals there and lives by metabolizing perspiration.

The biggest mammal that makes a burrow is the polar bear.

Now... hell, the blue whale's no longer the world's biggest mammal.

Other rarely seen big mammals of the Indochina peninsula, also discovered in the 1990s:

They crawled into a forest like the big, unlucky mammals they were.

"It's very rare to find a big mammal we did not know about," he said.

"Neither are we, relative to the rest of the big mammals," Pat said.