Written by neobita | 01 October 2010
Posted in Knowledge - Science

Cetaceans:
The cetaceans (whales, dolphins and porpoises) are marine mammal descendants of land mammals. Their terrestrial origins are indicated by:

Their need to breathe air from the surface;
The bones of their fins, which resemble the limbs of land mammals; and
The vertical movement of their spines, characteristic more of a running mammal than of the horizontal movement of fish.

Pinnipeds:
(from Latin pinna, wing or fin, and ped-, foot) or fin-footed mammals are a widely distributed and diverse group of semi-aquatic marine mammals comprising the families Odobenidae (the walrus), Otariidae (eared seals, including sea lions and fur seals), and Phocidae (earless seals).

Evolution does come with all sorts and sizes eh?