Baby Seal

Pinniped limbs, or flippers, are proportionally shorter than those of most other mammals. Their fingers are bound together by a web of skin (as are its toes). They also have claws either on the front flippers (earless seals) or back flippers (eared seals). Because water has a much higher density than air, their flippers can be much smaller proportionately in relation to their size than bird or bat wings.
Physiology