The 50-pound penguin at Australia's Sea Life Melbourne Aquarium is now roughly 9 months old and losing his downy fluff in favor of adult plumage. (Credit: Sea Life Melbourne Aquarium) Explore ...

Meet Pesto the king ... Penguins are also sexually monomorphic, which means you can’t tell their sex by looking at them. In ...

This story appears in the September 2009 issue of National Geographic magazine. First comes the Noise, the turbulent din of king penguins calling, fighting, courting, like the ultimate schoolyard ...

Photograph: Kit Haselden King penguin chicks are known to put on weight very quickly until around the time of their first birthday, when they then begin to lose baby fat and fluffy feathers.

A huge king penguin chick ... “Such a small head for such a big body,” one admirer remarked on Friday as a crowd gathered ...

With brown fur and almond-shaped eyes, a baby penguin emerged from the comfort of its shell that had been home for the past six weeks. Its Dec. 15 birth at the Lincoln Children’s Zoo in Nebraska ...