Cheaters do prosper. Just ask a cuckoo.

The cuckoo thrives by cutting corners

Cuckoo
(Image credit: (Martin B. Withers/Frank Lane Picture Agency/Corbis))

The common cuckoo is a parasite, as are many of its cousins in the family Cuculidae. "Parasite" is a word that usually conjures images of some insect worming its way into your body and exploiting it from within, but you can rest easy knowing that a 13-inch-long bird isn't going to try to take up residence in your intestines. These guys are brood parasites: They lay their eggs in the nests of other bird species, and outsource the care and raising of their chicks to unwitting foster parents.

They're really good at what they do, too. The adults, chicks, and eggs often all bear a close resemblance to their counterparts in the host species. They can even mimic the songs and calls of their hosts. This all helps to keep the new parents from catching on to the ruse. And when the cuckoo chicks hatch, they frequently push their foster siblings out of the nest to secure more food for themselves.

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