the differences between seals and sea lions.
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.
And unlike other pinnipeds I've encountered, elephant seals don't go, "Ork-ork-ork-ork-ork." Their vocalizations sound like loud, deep, wet burps. Maybe that's what a fish diet will do to you.