Eared seals & sea lions
On land, eared seals and sea lions rotate their hind flippers to face forwards to use them like a foot, and use their front flippers to prop themselves up. This means they are quite agile on land and can propel themselves forward with some speed. 

They have an outside ear flap, which is how they get their name. However, the ear flap is very small so that it does not slow them down in the water.

Galapagos fur seal

 

Sea lions are the fastest swimmers, and can swim at up to 40 kmh.

 

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