They swim with efficient, undulating whole-body movements using their more-developed rear flippers.

Claws scythed on the rear flippers.

A turtle stopped just inches from Con's foot and started digging a hole in the sand with her rear flippers.

They used their flippers to propel themselves through the water, rather like a turtle except that they used both the front and rear flippers.

In fact, the opposite was true, as turbulence from the front flippers interfered with the efficiency of the rear flippers.

One sporty pinniped body surfs along a wave until, with a flick of its rear flippers, it disappears.

After she had dug a shaft several feet deep, she "cupped" her rear flippers to enlarge and round out the bottom.

As a sign, she drew one of her rear flippers over her tail.

One of the rear flippers was badly damaged and nearly torn off, revealing some intestine.

She then uses her rear flippers to dig a small egg chamber.