In this photo from Walt Disney Studios, a great white shark is seen leaping out of the water. Business Wire
A great white shark breaches the water near Adelaide, Australia, in March 2002. An Australian firm released an electronic shark shield in March 2002 that, when attached to swimmers, emits and electronic pulse in an attempt to deter sharks. Seachangetechonology/Reuters/FILE
A diver in a cage encounters a great white shark off South Africa. Newscom
A great hammerhead is seen in Walker's Cay in the Bahamas. The great hammerhead, found in the North Atlantic and East Pacific oceans, feed on open ocean fishes, as well as other sharks. Newscom
A Baja Adventures guest swims with a young whale shark near Las Animas Wilderness Lodge in the Sea of Cortez in Mexico. The Sea of Cortez is one of the few places in the world where whale sharks congregate predictably. They start showing up in the summer and then the peak season for whale shark-watching is from September until the end of October. Whale sharks are the largest sharks and the largest living fish species. The largest confirmed whale shark was over 40 feet in length, and the heaviest weighed 79,000 pounds. Baja Adventures/AP
A basking shark is seen here. Basking sharks are the second largest sharks after the whale shark. They are filter feeders, eating mostly zooplankton and small fish, and are considered generally harmless. Newscom
A blue shark swims in La Jolla, Calif., in August 2009. Newscom/FILE
White House staff members carry a large inflatable shark as preparations are under way for President Obama's luau on the South Lawn of the White House in June 2009. Ron Edmonds/AP
A visitor poses with his head in the jaws of a shark sculpture at the Ocean Park Zoo in Beijing in August 2009. Ng Han Guan/AP
Scientists measure a sand tiger shark named "Sharkline" at the sea center in Burg on the island of Fehmarn, Germany, during the annual animal inventory in January. Some 1,500 marine animals of 250 species live at the center. Heribert Proepper/AP
A sandbar shark exhibit is seen at Coney Island in Brooklyn, New York. Newscom
Sharks swim near the surface. Newscom
A scalloped hammerhead shark is seen near the Galapagos Islands, off Ecuador. Newscom
A juvenile great white shark swimming in the Atlantic Ocean about 20 miles off the coast of Gloucester, Mass., in the rich fishing ground known as Stellwagen Bank on June 26. The shark was pulled up by Gloucester-based boat, Sweet Dream III, tagged, and returned to the sea. Bruce Sweet/AP
A shark leaps into the water off Seal Island in False Bay, South Africa, in March. Geoff Spiby/Newscom
A Caribbean reef shark is seen off the Bahamas. Newscom
A close-up of a great white shark's mouth is seen off South Africa. Newscom
Lemon sharks swim in the Atlantic Ocean off the Bahamas in October 2009. Newscom
An epaulette shark, a species of long-tailed carpet shark, is seen at Spain's Zoo Aquarium of Madrid in March. Newscom
Visitors watch a sand shark inside an aquarium on display at Sony Building in Tokyo on July 22. As a part of the 43rd Sony Aquarium Exhibit, fish from Okinawa are on display in tanks and Kuroshio Current and Okinawa Churaumi Aquarium are projected on a giant 200-inch 3D screen. This year's Sony Aquarium exhibit runs from July 19th to August 31st, and has numerous fish on loan from the Okinawa Sea Aquarium. Newscom
Chompie, an inflatable shark, is seen at the Discovery Channel headquarters in Silver Spring, Md., to promote "Shark Week," a yearly week of programming that focuses entirely on sharks. Kristoffer Tripplaar/Sipa Press/Newscom
A new study has looked at a shark's changing buoyancy over time to track the depletion of its fat reserves during its long migration.
Before a shark makes a long trip, it has a snack – a seal snack.
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