Sharks are found in deep and shallow waters throughout the world’s oceans, with some migrating vast distances to breed and feed. Some species are solitary, while others hang out in groups to varying degrees. Lemon sharks, for example, have been found to congregate in groups to socialize.
Scientists are still trying to figure out how long sharks live and have only studied the ages of a fraction of shark species. Most notable is the Greenland shark, Earth’s longest-lived vertebrate at 272 years.
Most sharks eat smaller fish and invertebrates, but some of the larger species prey on seals, sea lions, and other marine mammals.