Penguins, which are related most closely to the albatrosses , are the most highly specialized of all birds for marine life. They swim entirely by means of their flipperlike wings, using their webbed feet as rudders. Seven species of penguins will now join polar bears on the list of species endangered by climate change and other environmental threats, the U.S. Fish and Wildlife Service (FWS). Worst off: the African penguin, which is disappearing due to overfishing and oil pollution.

Reference : Wikipedia

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