WTF Fun Fact – Fairy-Wren Secret Tune

Fairy-wrens often have other birds laying eggs in their nests (a brood parasite). They have adapted by singing a special tune to their eggs. Once hatched, those that sing the password get food while any brood parasite chicks go hungry. WTF Fun Facts

Source: https://www.nationalgeographic.com/science/phenomena/2012/11/08/fairy-wrens-teach-secret-passwords-to-their-unborn-chicks-to-tell-them-apart-from-cuckoo-impostors/

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