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Why do flightless birds such as ostrich and emu have wings? - My Q/A Corner
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Hollow Bird Bones - Adaptations for Flight - YouTube
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42 Facts about Dinosaurs
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Birds have hollow bones, which help them fly. | Beautiful Bird Pictures
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All About Bird Anatomy | Bird Academy • The Cornell Lab
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Class Aves – The Biology Classroom
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Why do flightless birds have wings? - Curious
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How Many Bones are There in a Bird's Body?