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While this kind of animal cruelty would be upsetting even if it happened to a simpler species, it is particularly notable here because pinnipeds — i.e., semi-aquatic and fin-footed carnivores like walruses, seals and sea lions — are very smart.

Last year was a bad one for sea lions, said Will Elgar, director of the aquarium’s animal training for pinnipeds, the term for fin-footed marine mammals.

Last year was a bad one for sea lions, said Will Elgar, director of the aquarium's animal training for pinnipeds, the term for fin-footed marine mammals.

Pinn′iped, Pinnat′iped, fin-footed, as a bird; Pinn′ūlate, -d.—n.

When the sea was a little agitated on the Brazilian coast, we frequently saw the large sea-bladder floating on the surface; here we also caught with our net a new species of small Hyalœa, and of the fin-footed Steira, which approaches the nearest to the Limacina.