Online and print resources for WHITE SHARK/RED TRIANGLE.

Production credits for WHITE SHARK/RED TRIANGLE.

View additional resources, online and in print, for NATURE's "The Secret World of Sharks and Rays."

When the quarry is Great Whites, Tigers, and other potentially deadly sharks, divers often descend to the sharks' territory in protective cages.

Sharks come in a dizzying array of shapes and sizes. Here are profiles of just four of the more than 350 known species.

The ocean's 350 species of sharks come in all shapes and sizes -- from gentle 50-foot giants that graze on plants to bizarre-looking bat-faced dwarfs.

NATURE lifts part of the veil of mystery shrouding some fascinating -- and often fearsome -- creatures in "The Secret World of Sharks and Rays."