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Birds have feathers, wings, lay eggs and are warm blooded.
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There are around 10000 different species of birds worldwide.
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The Ostrich is the largest bird in the world. It also lays the largest eggs and has the fastest maximum running speed (97 kph).
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Scientists believe that birds evolved from theropod dinosaurs.
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Birds have hollow bones which help them fly.
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Some bird species are intelligent enough to create and use tools.
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The chicken is the most common species of bird found in the world.
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Kiwis are endangered, flightless birds that live in New Zealand. They lay the largest eggs relative to their body size of any bird in the world.
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Hummingbirds can fly backwards.
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The Bee Hummingbird is the smallest living bird in the world, with a length of just 5 cm (2 in).
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Around 20% of bird species migrate long distances every year.
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Homing pigeons are bred to find their way home from long distances away and have been used for thousands of years to carry messages.