A young reptile must use its natural speed to steer free from the shark. Watch this video to learn how another prehistoric animal keeps himself under the sea.

Check out this stand-off between a team of half-pound water dikkops and a half-ton crocodile against a hungry monitor lizard. As the lizard is hunting for crocodile eggs, a pair of feisty dikkops act as a defense for themselves and the...

Cocos Island, a remote volcanic summit in the middle of the Pacific Ocean, serves as a beacon for hungry predators, including thousands of hammerhead sharks that travel here each year in search of prey. This video segment from NOVA:...

In this video, students learn about lemon sharks and how their grazing habits help keep mangrove ecosystems healthy. [3:57]

Hank gets to the more violent part of community ecology by describing predation and the many ways prey organisms have developed to avoid it. [10:23]

In this Nature video, watch a battle between a loggerhead turtle and a shark. [2:41]