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The sea lion differs from the seal in that its pinnae are covered by external ear flaps. This is why they are known as the “eared seals.” Sea lions also have longer necks than seals. The body of the sea lion is much sleeker than that of the seal, even though sea lions are generally larger than most seals: a male sea lion of certain species can tip the scales at over six hundred pounds, compared to less than four hundred for a large seal.

Another very different adaptation of the sea lions is the flipper. Sea lions’ front flippers have only a partial fur covering, unlike the seal, whose flippers are covered entirely by fur. Sea lions’ first toes are longer than the other toes. Their hind flippers are extremely flexible, and can actually rotate forward and beneath the body. This enables sea lions to move around on land with ease, unlike the seal. Behaviorally, sea lions are usually more vocal than seals. Sea lions are called “sea dogs” due to their unique barking noise, whereas seals tend to make much quieter grunting noises.