For some animals, raising young takes effort. In birds, this involves building nests, incubating eggs and feeding the chicks. Because of this, sometimes it might be better to save themselves from the effort and cheat instead. Avian brood parasitism is a strategy that has evolved independently seven times in around 100 species of birds, and these birds can exploit over 950 host species. So how has it evolved?

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References:
Krüger O. Evolution of avian brood parasitism and phylogenetic history of brood parasites. In: Avian brood parasitism. Springer, Cham; 2017. p. 43–59.
Krüger O & Davies NB. The evolution of cuckoo parasitism: a comparative analysis. Proc Biol Sci 2002;269:375–381.
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Soler M. Brood parasite-host coevolution in america versus europe: egg rejection in large-sized host species. Ardeola 2016;63:35–48.
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#evolution #naturalselection #broodparasite #broodparasitism #parasite #nature #biology #evolutionarybiology #science #animals #cuckoo #birds #zoology #commoncuckoo #reedwarbler

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