Pinniped

A semiaquatic carnivorous mammal in the group comprising seals, sea lions, and walruses. Pinnipeds have flippers and spend much of their lives in the ocean, returning to land or ice to rest and reproduce.

True seal: A member of the family Phocidae, typically lacking external ear flaps and moving on land by undulating its body. Phocids are one of the three living pinniped families.
Diving physiology: The physiological adaptations that allow animals to remain underwater while limiting oxygen use. Pinnipeds store oxygen and manage blood flow during extended dives.
Marine mammal: A mammal adapted to life in the ocean or other marine environments. Pinnipeds are one group within this broader ecological and biological category.
Pinniped evolution: The evolutionary history through which pinnipeds became specialized for life in the sea. It explains the origins of the group’s aquatic adaptations and living families.
Marine food web: A network of feeding relationships among organisms in a marine ecosystem. Pinnipeds are predators and prey within these interconnected systems.
Eared seal: A pinniped in the family Otariidae, including sea lions and fur seals, with external ear flaps and rotating hind flippers. Otariids form a family distinct from true seals and walruses.
Mammalian diving reflex: A set of responses to submersion, including slowed heart rate and reduced blood flow to some tissues. This reflex helps pinnipeds conserve oxygen underwater.
Pinniped colony: A group of pinnipeds that gathers at a shared breeding, resting, or molting site. Many pinnipeds congregate on beaches or ice during key parts of their life cycle.
Puijila: An extinct semiaquatic carnivoran from the Miocene of the Canadian Arctic, known from a partial skeleton. Its anatomy offers evidence about early stages in pinniped evolution.
Keystone species: A species whose ecological effects are disproportionately large relative to its abundance. Some pinniped populations strongly influence prey communities and wider ecosystem dynamics.

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