Sharks do not sleep in the way that land animals such as humans do, but sharks do experience quiet periods and undergo what is called sleep-swimming. It was once believed that all sharks had to stay awake constantly in o... More »

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Sharks do not sleep in the same manner most other animals do, instead having split periods of rest and activity, according to the Florida Museum of Natural History. Many species of shark must maintain movement in order f... More »

Sharks rest in an approximation of what is termed sleep in land animals, though they do it with their eyes open. However, some sharks are nocturnal, which means they are active at night and rest during the day, and other... More »

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 »

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 »

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 »

Great white sharks do not eat killer whales, and it is, in fact, the other way around. Research has shown that the screams of killer whales have been known to drive away marine life, like great white sharks, hammerheads ... More »