A seal is a marine mammal that belongs to the family Phocidae or Otariidae. They are known for their streamlined bodies, flippers, and ability to swim efficiently in water. Seals are found in various oceans and seas around the world, often resting on beaches or ice. They primarily feed on fish, squid, and other marine organisms. Seals are social animals and often live in groups called colonies. They communicate through vocalizations and body language. Some species, like the California sea lion, are known for their playful behavior, while others, like the harbor seal, are more solitary. Seals play an important role in marine ecosystems.