Track the Nation’s T-Rex as it Arrives at the Smithsonian

Sand strikers, also known as bobbit worms, are primitive-looking creatures that lack eyes, or even a brain. Despite this, they are savage predators who shoot out grapple-like hooks to reel in passing fish.

This Terrifying Worm Snatches Fish From the Ocean Floor (3:18)

For six weeks, luna moth caterpillars gorge themselves on the leaves of the marula tree. Then, when they're ready, they instinctively weave giant cocoons around themselves in preparation for their stunning metamorphosis.

Timelapse Footage of a Giant Caterpillar Weaving Its Cocoon (2:34)

A diver stumbles across a whale shark trapped in a commercial fishing line. Sensing the diver is there to help, the goliath lies still while the rope is cut.

A Whale Shark Cooperates With a Diver Saving Him (1:28)

In 1992, Christopher McCandless set off to test if he could survive alone in the wilds of Alaska. It didn't go as planned.

What Happened to Chris McCandless? (3:38)