Every cuckoo is an adopted child—raised by foster parents, into whose nest the cuckoo mother smuggled her egg. The cuckoo mother is aided in this subterfuge by her resemblance to a bird of prey. There are two variants of female cuckoos: a gray morph that looks like a sparrowhawk, and a rufous morph. Male cuckoos are always gray.
Evolutionary biologists show that the color variants of female cuckoos are based on ancient mutations retrieved 24 April 2024 from https://phys.org/news/2024-04-evolutionary-biologists-variants-female-cuckoos.html
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