Sea World's killer whale collection needs constant replenishing. The average life span of the animals in captivity is less than half the average for killer whales in the ocean.

Shamu the killer whale is Sea World's Mickey Mouse; whales named Shamu are the star attractions of three parks and the focus of their marketing efforts.

When you extend life span, that's really something. That's hard to do.

In one century, we've added 28 years to our average life span - a change so rapid that our brains couldn't possibly have evolved to accommodate it.

We estimate that between 40,000 and 45,000 sea otters have died since 1990 from killer whale predation in roughly 3,300 kilometers of shoreline. This unusual behavior of killer whales toward sea otters ultimately raises questions about the health of our oceans.

In the early '90s, we discovered mutations that could double the normal life span of worms.