Focas, commonly known as seals, are marine mammals found in oceans and coastal areas around the world. They belong to the family Phocidae and are characterized by their streamlined bodies, flippers, and whiskers. Seals are excellent swimmers, using their front flippers to propel themselves through the water while their hind flippers help with steering. There are several species of focas, including the harbor seal and the elephant seal. They primarily feed on fish, squid, and crustaceans. Focas are known for their social behavior, often seen lounging on rocks or beaches in groups, and they are also known to communicate through a variety of vocalizations.