Sealing the Deal

Seals and Sea Lions are both semi-aquatic mammals belonging to the group Pinnipeds, meaning “fin-footed”. The main difference between the two is that sea lions have little flaps over their ears, whereas “true” seals are truly earless.  “True” seals also have backward-pointing flippers which means they undulate along the ground, and fur seals and sea lions can rotate their hind flippers allowing them to “walk” along the ground.

Source: http://www.livescience.com/27870-seals.html