One of the main characteristics we associate with birds is their ability to fly. But several bird species have evolved in a way that prevents them from flying
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Here are 8 birds that did have the ability to fly at some point in the past, but can't do it any longer
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Penguins are one of the most beautiful and exotic birds to look at. All 18 species of penguin are unable to fly and are in fact better built for swimming and diving
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Kakapos look like half owls and half parrots but unlink them, they cannot fly. This nocturnal parrot has an owl's face, penguin's stance, and duck's gait, as per Britannica
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Cassowary, a native of Australia, also cannot fly. This giant bird with vibrant colours and an attractive hood on top of its head is known to kill humans
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Kiwis are small, charming birds native to New Zealand. They have hidden vestigial wings and soft, hairlike feathers. They too cannot fly
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Takahe, also a native of New Zealand, sports bright blue and green plumage and a red bill. This flightless bird can live up to 20 years
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Ostriches are one of the world's largest birds. Their eggs are also the world's largest - about 5 inches in diameter. They cannot fly because of their high body weight
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The weka is another flightless bird of New Zealand. This brown, chicken-sized bird is a skilled swimmer
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Emus have long legs built for running. But because of their heavy bodies and short wings, they are unable to fly