The familiar call of the cackoo in Europe is made only by the male bird. Although paintings of cuckoos often show them with beaks wide open, they sing 'cu-coo' with the beak closed.

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Source: https://www.pitara.com/non-fiction-for-kids/did-you-know-for-kids/the-familiar-call-of-the-cackoo-in-europe/

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