King penguins -- King penguins are the second largest penguin species in the world (behind emperors). Although they spend much of their time at sea, where they subsist on a diet of lanternfish, they head to land to incubate their eggs and rear chicks. Over the past century king penguin numbers have grown substantially on South Georgia.
Macaroni penguins -- These crested penguins take their name from an 18th century European fashion trend. Like kings they spend a lot of time in the open water, but eat krill, a small crustacean. Adults weigh approximately 12 pounds (5.4 kilograms) and can be as tall as 28 inches (71 centimeters). South Georgia's population has declined, although there has been a recent increase, says Norman Ratcliffe of the British Antarctic Survey.
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