Blue-blooded crabs? Platypus that sting? One-hundred-year old reptiles? Meet some of nature's longest-surviving species. Discover the stories of these ... animals and find out how they help scientists piece together evolutionary history.

Slime shooters -- The story of life -- Green eggs and sand -- Tangle of tentacles -- Out of the ooze -- Old, cold, and slow -- Australian oddball -- A bite like a snake -- Nature's survivors.