Though they are feathered they spend most of their lives at sea and must return to land to mate and lay eggs. On land, they either waddle on their feet or slide on their bellies.
Of the 17 species of penguins, only four breed on the Antarctic continent itself: the Adelie, the Emperor, the Chinstrap and the Gentoo penguins. Penguins are true flightless birds.To withstand the harsh conditions of the Antarctic, their bodies are insulated by a thick layer of blubber and a dense network of waterproof plumage.
Penguins also have natural predators such as leopards,seals,sharks and sea lions.
But, unfortunately, we humans, are the main predators ,responsible for the death of many penguins.
Source:
http://www.antarcticconnection.com/antarctic/wildlife/penguins/index.shtml
http://en.wikipedia.org/wiki/Penguins http://www.worldwildlife.org/species/finder/penguins/penguins.html
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