Swimming with the Sharks and Catching a Free Ride (and Free Lunch, too)

Remora, a kind of long flat fish, attaches itself to sharks with sticky disks. In doing so, it gets a free ride, and a bodyguard -- the shark. In exchange, the Remora helps the shark in such ways as eating parasitic crustaceans off of its body. After sharks eat their prey, the Remora also gets to feast on the remains!