What shared ability often causes casual observers to confuse fur seals and sea lions?

Answer

Rotating hind flippers forward to walk on land

Both sea lions and fur seals can rotate their rear flippers underneath their bodies, allowing them to 'walk' or gallop across land, which leads to frequent misidentification.

What shared ability often causes casual observers to confuse fur seals and sea lions?
mammalPinnipedsea lionFur Seal