Transcript: Unlikely Travel Companions

This shark is not a lonely hunter. A Jack intentionally swims alongside it, using the shark as a moving blind for its daytime attacks.

In fact, smaller fish often accompany sharks on their travels. (pause) Fish, like these Mackerel, bump against the shark's sand papery skin to rid themselves of loose scales and parasites.

If that wasn't enough, Sharks and Rays have fish living on them, like this Sharksucker fish. Its dorsal fin works like a suction cup so it can bum a free ride.

In contrast to their reputations, certain sharks actually seek out social interaction. These Scalloped Hanunerheads look for company in Barberfish. Instead of fleeing, Barberfish rush to greet the intimidating sharks.

The smaller fish help rid the Hanunerheads of parasites. It's a nice exchange- one gets an easy meal- and the other gets groomed.

Their relationship challenges the stereotype that sharks are mindless killers.