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Why some cuckoos have blue eggs

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Cuckoos are nest parasites, meaning they lay their eggs in other birds' nests. The female cuckoo has to lay eggs that mimic the color, size and shape of the eggs of the host bird. Using a massive data set, including data from museum eggs that are over 100 years old, researchers have figured out how the ability to lay blue eggs is inherited.H2iKC7clvWI


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