Phocids, commonly known as true seals, are a family of marine mammals found in oceans around the world. They are characterized by their streamlined bodies, lack of external ear flaps, and the ability to move efficiently in water. Phocids include species such as the harbor seal and the elephant seal, which are known for their unique adaptations to aquatic life. These animals primarily rely on their forelimbs for swimming, using their hind limbs for steering. Phocids are often found on beaches or ice floes, where they haul out to rest, breed, and molt. They are important members of marine ecosystems, serving as both predators and prey.