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 »

How sharks reproduce varies and can include laying eggs in secluded nursery waters or giving birth to live pups after the lengthy internal gestation of eggs, but all sharks mate via internal fertilization during copulati... More »

www.reference.com Pets & Animals Marine Life Sharks

The size of a shark depends on its species. The largest living shark, the whale shark, averages 31.82 feet long. The extinct megalodon was even bigger at about 60 feet long. The smallest shark is the dwarf lanternshark, ... 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 »

There are not any animals or predators who eat adult hammerhead sharks. Larger sharks may prey on injured or young hammerhead sharks. More »

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

The great white shark is an apex predator, and as such, healthy adults of the species have no natural predators. Only one real threat faces the great white shark: humans that accidentally catch them, illegally poach them... More »

www.reference.com Pets & Animals Marine Life Sharks