One of my personal favorites is the sea lion... Did you know that they are part of the dog family? And that they have marked differences from seals? For example, Sea lions are brown, bark loudly, "walk" on land using their large flippers and have visible ear flaps. Seals have small flippers, wriggle on their bellies on land, and lack visible ear flaps.
When sailing on San Diego Bay, you can almost always count on a sea lion sighting!