mostly viviparous- few exceptions They have broad, paddle-like flippers and notched tails. sp. Gray Whale (U.S. National Park Service) - nps.gov Their limbed ancestors, such as the Eocene . Well adapted to a semiaquatic life, nutria have small eyes and ears, and large, webbed hind feet for swimming. share many/ all characteristics with terrestrial birds (no webbed feet) The tubercles on the flippers of humpback whales improve the hydrodynamics of the flipper at their size. There are several species; the North American river otter lives along rivers, lakes and large creeks. Beneath a whales' flipper isn't the paddle-like anatomy you might imagine, but instead a pentadactyl limb consisting of five finger-like bony protrusions. These seals have flippers, fore flippers, and hind flippers. Their whiskers are sensitive to the movements of small sea creatures. b Manatees have paddle - shaped tails more like a beaver that moves vertically while swimming . [4], The evolution of flippers in penguins was at the expense of their flying capabilities, in spite of evolving from an auk-like ancestor that could 'fly' underwater as well in the air. Attivit . In the latter (mysticetes), the first digit ray may have been lost as late as 14 million years ago. seasonal migrations from feeding to breeding grounds (long distances), internal copulation feather are not waterproof, most diverse group of sea birds Forelimbs are modified into broad paddle-like flippers while posterior limbs are absent. Dolphin Species Guide: 27 Types of Dolphins You Need to Know - TheCoolist Co3+(aq)+6NH3(aq)Co(NH3)63+. They can use their long flippers to steer and the bumpy tubercles help with speed. This makes them spend most of their time underwater. Whales have torpedo-shaped bodies with non-flexible necks, limbs modified into flippers, non-existent external ear flaps, a large tail fin, and flat heads (with the exception of monodontids and ziphiids).
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