Seals are carnivores, they eat fish, shrimp, and other animals that they chase out of the water. They grab the fish and swallow them whole. The crabeater seal though gets small krill out of the water with comb-like teeth. Seals have very well developed senses that they use to hunt. Also, seals like to eat squid and octopus because they are easy to swallow because they are slimey. They also will sometimes eat a sea bird if the fish are running low. Though seals are meat eaters they will sometimes eat whatever is thrown to them. Therefor we must make sure that nothing harmful is thrown to them.

Most seals eat fish and sometimes squid. The leopard seal, an Antarctic species, may have the most diverse diet of all, commonly hunting penguins and other seabirds, smaller seals, as well as fish, squid, krill (small shrimplike crustaceans), and other invertebrates, as well as feeding on carcasses of dead whales. Leopard seals sometimes hunt humans, lunging onto ice floes to chase people who are on foot, and also threatening scuba divers underwater.

Sea lions and walruses may occasionally kill and eat other seals, although more commonly sea lions eat fish, and walruses dive to the bottom and dig for clams, worms, crustaceans, and other organisms from the mud. Walruses have a large “mustache” of especially sensitive whiskers, or vibrissae, that help them detect their food on the dark sea floor. A big walrus can eat about 45 kg (about 100 lb) of shellfish in one day.

Crabeater seals of the Antarctic are known to eat fish but are unusual in that they feed primarily on krill using unique branching teeth. The seal’s upper and lower teeth mesh together, forming an efficient sieve that acts similarly to the giant filtering plates of baleen found in krill-eating whales.