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Though sharks are considered apex predators, they are often eaten by humans and are sometimes eaten by killer whales. Shark embryos from different fathers will also eat each other in utero, with the largest embryo of the... More »

www.reference.com Pets & Animals Marine Life Sharks

All species of sharks are carnivores, not omnivores. On rare occasions, a shark will dine on something other than meat, such as seaweed, but it happens so rarely that it's not common enough to change the shark's classifi... More »

www.reference.com Pets & Animals Marine Life Sharks

Sharks are boneless fish with have an anatomical structure that differs from other marine fish. Sharks have skeletons made of flexible cartilage and have several fins located on their bodies. Most sharks have a pair of d... More »

www.reference.com Pets & Animals Marine Life Sharks
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Cookiecutter sharks, also known as cigar sharks, are unusual, small predators that commonly attack much larger prey. Their upper and lower teeth are quite different, with the hook-like upper teeth being much smaller than... More »

www.reference.com Pets & Animals Marine Life Sharks

Over the years, experts have been trying to determine exactly why great white sharks attack humans. Three of the main theories include the investigatory theory, mistaken identity theory and social-defensive theory. More »

www.reference.com Pets & Animals Marine Life Sharks

Sharks are apex predators that have no natural enemies; however, humans are predators of sharks, with an estimated 30 to 100 million sharks are killed every year by fisherman. This has caused many species of sharks to be... More »

www.reference.com Pets & Animals Marine Life Sharks

Tiger sharks are apex predators, but they are susceptible to being preyed upon by other apex predators -- especially humans. In addition to being consumed by humans as a result of finning and fishing operations, tiger sh... More »

www.reference.com Pets & Animals Marine Life