Here are the California Sea Lions at Port Dock 1 in Newport, Oregon. They put in a new dock so the sea lions were making good use of it and barking up a storm. It was a very fun night. :)
Now you know what it sounds like, if you ever hear a sound like that, it's a California Sea Lion. No other pinnipeds (seals, sea lions, and walruses) make a sound like that.
Go here to my other post to learn all about California Sea Lions