Chunky Sea Lion Tanks Sailboat If this next story becomes a movie, you could think of it as a sequel to Jaws. Except it would have to be called, Fat. Enormous sea lions have been making noise, and even attacking boats off Newport Beach, Calif. One of the slick, black creatures tipped over a mother and child in a kayak. And then 15 sea lions jumped onto a sailboat. The boat finally sank under the weight of the animals, which weigh 600 to 800 pounds each.