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Walrus: A large, aquatic mammal characterized by its distinctive tusks and whiskers. As a pinniped, it is part of the fin-footed family of marine mammals, which also includes seals and sea lions. Walruses are well adapted to life in the Arctic waters, with thick blubber providing insulation and a layer of skin that helps keep them buoyant. They have powerful flippers for swimming and can hold their breath for up to 30 minutes while diving for food. Adult males can weigh up to 2,000 pounds, making them the largest of all pinnipeds. Walruses primarily feed on benthic invertebrates, such as mollusks and worms, which they crush using their powerful jaws. They are social animals that often gather in large herds, particularly during feeding and breeding seasons. Pups are born with a thick coat of fur called lanugo, which they shed after several weeks. Walruses play an important role in the Arctic ecosystem as both predators and prey, and have been hunted for centuries for their meat, ivory tusks, and hides.