A great white shark opens it mouth just before it attacks its prey with a crippling, powerful bite.  After the prey has been disabled, the shark will often wait for it to weaken from blood loss before resuming the attack.  If the shark looses a tooth in the course of the bite, a replacement just behind it will move forward to take its place, Carcharodon carcharias, Guadalupe Island (Isla Guadalupe)

An enormous great white shark, Guadalupe Island, Mexico, Carcharodon carcharias.

A whale shark swims through the open ocean in the Galapagos Islands.  The whale shark is the largest shark on Earth, but is harmless eating plankton and small fish, Rhincodon typus, Darwin Island

A whale shark swims through the open ocean in the Galapagos Islands. The whale shark is the largest shark on Earth, but is harmless eating plankton and small fish. Rhincodon typus, Darwin Island, Galapagos, Ecuador.

A great white shark swims through the clear waters of Isla Guadalupe, far offshore of the Pacific Coast of Baja California.  Guadalupe Island is host to a concentration of large great white sharks, which visit the island to feed on pinnipeds and tuna, Carcharodon carcharias, Guadalupe Island (Isla Guadalupe)

A great white shark swims through the clear waters of Isla Guadalupe, far offshore of the Pacific Coast of Baja California. Guadalupe Island is host to a concentration of large great white sharks, which visit the island to feed on pinnipeds and tuna. Carcharodon carcharias, Guadalupe Island (Isla Guadalupe), Mexico.

Galapagos shark swims over a reef in the Galapagos Islands, with schooling fish in the distance, Carcharhinus galapagensis, Wolf Island

Galapagos shark (Carcharhinus galapagensis) at Wolf Island in the Galapagos Islands, Ecuador.

Scalloped hammerhead shark swims over a reef in the Galapagos Islands.  The hammerheads eyes and other sensor organs are placed far apart on its wide head to give the shark greater ability to sense the location of prey, Sphyrna lewini, Wolf Island

Scalloped Hammerhead Shark, Wolf Island

A great white shark swims through the clear waters of Isla Guadalupe, far offshore of the Pacific Coast of Mexico's Baja California. Guadalupe Island is host to a concentration of large great white sharks, which visit the island to feed on pinnipeds and use it as a staging area before journeying farther into the Pacific ocean, Carcharodon carcharias, Guadalupe Island (Isla Guadalupe)

Great White Shark, Guadalupe Island

Tiger shark, Galeocerdo cuvier

Tiger shark, Galeocerdo cuvier, Bahamas.

A great white shark swims underwater through the ocean at Guadalupe Island, Carcharodon carcharias, Guadalupe Island (Isla Guadalupe)

Great White Shark, Guadalupe Island, Mexico

Blue shark underneath drift kelp, open ocean, Prionace glauca, San Diego, California

Blue shark underneath drift kelp, open ocean, Prionace glauca

A blue shark swims through the open ocean in search of prey, backlit by the sunset, Prionace glauca, San Diego, California

A blue shark swims through the open ocean in search of prey, backlit by the sunset. Prionace glauca.

Caribbean reef shark, ampullae of Lorenzini visible on snout, Carcharhinus perezi

Caribbean Reef Shark, Bahamas

Scalloped hammerhead shark swims underwater at Cocos Island.  The hammerheads eyes and other sensor organs are placed far apart on its wide head to give the shark greater ability to sense the location of prey, Sphyrna lewini

Scalloped Hammerhead Shark, Cocos Island

Hammerhead sharks swim in a school underwater at Wolf Island in the Galapagos archipelago.  The hammerheads eyes and other sensor organs are placed far apart on its wide head to give the shark greater ability to sense the location of prey, Sphyrna lewini

Scalloped Hammerhead Shark, Wolf Island

Two satellite tags, below dorsal fin of great white shark.  The tags record the sharks movements, relaying data to researchers via satellite, Carcharodon carcharias, Guadalupe Island (Isla Guadalupe)

Two Satellite Tags, Guadalupe Island

North Pacific Yellowtail brushing against blue shark, Seriola lalandi, Prionace glauca, San Diego, California

North Pacific Yellowtail brushing against blue shark, Seriola lalandi, Prionace glauca

A great white shark swims just below the rippled ocean surface of Isla Guadalupe, far offshore of the Pacific Coast of Baja California, Carcharodon carcharias, Guadalupe Island (Isla Guadalupe)

Great White Shark, Guadalupe Island, Mexico

Dorsal fin of a great white shark breaks the surface as the shark swims just below, Carcharodon carcharias, Guadalupe Island (Isla Guadalupe)

Great White Shark, Guadalupe Island

Great white shark, dorsal fin extended out of the water as it swims near the surface, Carcharodon carcharias, Guadalupe Island (Isla Guadalupe)

Great White Shark, Guadalupe Island

Blue shark showing ampullae of Lorenzini, eye and small portion of nictitating membrane, Prionace glauca, San Diego, California

Blue shark showing ampullae of Lorenzini, eye and small portion of nictitating membrane, Prionace glauca

Blue shark, Baja California, Prionace glauca

Blue shark, dorsal aspect, Baja California. Prionace glauca.

Hammerhead sharks, schooling, black and white / grainy, Sphyrna lewini, Darwin Island

Scalloped Hammerhead Shark, Darwin Island

Blue shark and videographer, Prionace glauca, San Diego, California

Blue shark (Prionace glauca) and underwater videographer, open ocean, San Diego, California

Horn shark, Heterodontus francisci, San Clemente Island

Horn Shark, San Clemente Island

Blue shark, detail showing ampullae of Lorenzini, Prionace glauca, San Diego, California

Blue shark, detail showing ampullae of Lorenzini, Prionace glauca

Whale shark, Rhincodon typus, Darwin Island

Whale Shark, Darwin Island

Whale shark, Rhincodon typus, Darwin Island

Whale shark, Rhincodon typus, Darwin Island, Galapagos, Ecuador.

Scalloped hammerhead sharks, schooling over reef, Sphyrna lewini, Cocos Island

Hammerhead School, Cocos Island

Scalloped hammerhead shark, Sphyrna lewini, Cocos Island

Hammerhead School, Cocos Island

Caribbean reef shark, Carcharhinus perezi

Caribbean Reef Shark, Bahamas

Caribbean reef shark swims over a coral reef, Carcharhinus perezi

Caribbean Reef Shark, Bahamas

Tiger shark and photographer Keith Grundy, Galeocerdo cuvier

Tiger shark (Galeocerdo cuvier) and underwater photographer, Bahamas.

Tiger shark and live sharksucker (remora), Galeocerdo cuvier, Echeneis naucrates

Tiger shark and live sharksucker (remora), Galeocerdo cuvier, Echeneis naucrates

Whale shark, Rhincodon typus, Darwin Island

Whale Shark, Darwin Island

Galapagos shark, Carcharhinus galapagensis, Wolf Island

Galapagos Shark, Wolf Island

Scalloped hammerhead shark, Sphyrna lewini, Darwin Island

Scalloped Hammerhead Shark, Darwin Island

Scalloped hammerhead shark, black and white / grainy, Sphyrna lewini, Wolf Island

Scalloped Hammerhead Shark, Wolf Island

Lemon shark with live sharksuckers, Negaprion brevirostris, Echeneis naucrates

Lemon Shark, Bahamas

Lemon shark with live sharksuckers, Negaprion brevirostris, Echeneis naucrates

Lemon Shark, Bahamas

Silky shark, Carcharhinus falciformis, Cocos Island

Silky Shark, Cocos Island

White-tip reef shark, Triaenodon obesus, Cocos Island

Whitetip Reef Shark, Cocos Island

Whale shark with remora, Rhincodon typus, Remora, Darwin Island

Whale Shark, Darwin Island

Lemon shark with live sharksuckers, Negaprion brevirostris, Echeneis naucrates

Lemon Shark, Bahamas