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Brian J. Skerry

Great hammerhead sharks (pictured, an animal in the Bahamas) is the largest hammerhead species, reaching lengths of nearly 20 feet.

Tiger sharks are plentiful at Tiger Beach, a diving site in the Bahamas.

Hundreds of longfin inshore squid gather off the coast of Cape Cod, MA, to spawn each spring.

A great white swims off the Neptune Islands in southern Australia. Scientists once thought the predators hunted mostly close to home.

Whale sharks (pictured, an animal feeding on plankton off the Yucatán Peninsula) can manipulate the flow of water to capture their preferred food.

The Bahamas

An oceanic whitetip shark (not the animal involved in the encounter) swims off the Bahamas. Whitetips generally hunt at the surface, making this discovery all the more intriguing.

A female North Atlantic right whale and her new calf swim off Florida. There are only 400 of the marine mammals left on Earth.

A North Atlantic right whale surfaces off Cape Cod, Massachusetts.

A whale shark swims off the Yucatán Peninsula. These ocean giants can weigh up to 50,000 pounds (22,6000 kg).