Despite spending a lot of time in the water, sea lions are mammals so they can't breathe underwater and need to come up for air. California sea lions generally vocalize between 1 to 4 kHz. Sea lions and fur seals (members of the eared seal family) have visible ear flaps, while true seals only have ear holes. California sea lions are the "trained seal" of marine parks and circuses.

Lions can swivel and rotate their ears to orient them toward the direction from which a sound originated. The other resident eared seal is the Steller, or Northern, sea lion (Eumetopias jubata), a federally threatened species.

The anatomy of a Sea Lion is quite fascinating. 3. In addition, sea lions have a loud bark and walk on their large rear flippers versus seals more wriggle on their belly and have smaller rear flippers. Hearing is one of the most important senses for a California sea lion. Secondly, sea lions have small flaps for outer ears. They look like long flaps and while other animals that are similar have internal ears the majority of them don’t have external ears. Seals are quieter, vocalizing via soft grunts. They are uniformly dark brown and vocalize with the notable sea lion "bark". Third, sea lions are noisy. One of the unique characteristics of their anatomy is that they have external ears. You have to get very close to see the tiny holes on the sides of a seal’s sleek head. In order to maximise the amount of time they can spend underwater, hunting for prey, they have special adaptations to their nostrils and ears. Researchers believe that under water, a California sea lion can hear sounds in the range of 1 to 40 kHz, with a peak sensitivity of 15 to 30 kHz. The average hearing range for humans is about 0.02 to 20 kHz. They are well designed to allow them to live both in water and on land. When comparing a sea lion vs. seal you can spot the difference a few ways, one of which is the lack or presence of an ear. One quick way to tell a sea lion from a seal is to look at its ears. The "earless" or "true" seals lack external ears altogether.

Seals lack an external ear flap whereas sea lions have an external ear flap that is visible.

Seals, like the gray seal and harbor seal, typically have shorter flippers than their sea lion …
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