Fish

The shark attacked the 60-year-old man off Hilton Head Island where, two years ago, a shark also bit a lifeguard who was checking water conditions in the shallows.

The invasive fish, known as a pacu, originates from South America and has evolved human-like gnashers to accommodate its varied diet.

"Alien Sharks: Strange New Worlds" — part of the Discovery Channel's Shark Week — gives viewers an extraordinarily rare insight into how sharks mate in the wild.

Shark Week show delves into whether sharks off the coast of Florida are coming into contact with the huge quantities of cocaine that get dumped in these waters.

Deep-sea fish have evolved unique traits to thrive in their unforgiving habitat.

The great white shark population off in the North Atlantic plummeted during the 20th century — but the species is now making a major comeback, and recolonizing its former home.

NatGeo Sharkfest episode focuses on stories of whales and dolphins saving people from sharks. But are they really trying to protect us?

The SharkFest episode delves into the diets of the famed aerial-hunting great white sharks of South Africa's Mossel Bay — and seals are barely on the menu.

The slender "gulper eel" can unhinge its jaw and expand its throat, enabling it to eat squid-sized prey in a single gulp.