Penguins are any of the order Sphenisciformes of marine flightless birds, mostly black and white, found in the southern hemisphere. They range in size from 40 centimetres to 1.2 metres tall, and have thick feathers to protect them from the intense cold. They are awkward on land, but their wings have evolved into flippers, making them excellent swimmers. Penguins congregate to breed in 'rookeries', and often spend many months incubating their eggs while their mates are out at sea feeding. Research Penguin
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Abbreviations
Nature
Research Penguin
