Pierre the Penguin, 25, began wearing a wetsuit six weeks ago and has begun growing back his feathers. Unlike marine mammals, which have a layer of blubber to keep them warm, penguins rely on their waterproof feathers. Without them, the balding penguin avoided the water and ended up shivering on the sidelines while his peers played in their aquatic tank.
(Photo: AP Photo/Eric Risberg)
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