Lions and Whales

Can you spot the difference between a killer whale and a sea lion then go on to describe their oceanic relationship in the wild?
The orca or killer whale Orcinus orca is a toothed whale belonging to the oceanic dolphin family, of which it is the most prominent member.
Sea lions are pinnipeds characterized by external ear flaps, the ability to walk on all fours, short and thick hair, and a big chest and belly. Together with the fur seals, they comprise Otariidae, eared seals. Sea lions have six extant and one extinct species in five genera.