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While brood parasites occur among birds, fish and insects, the mechanics of this vary; typically, with birds, the brood parasite will lay its eggs in another bird's nest when that bird isn't looking.

In the case of the brood parasite, this often means its eggs will evolve to look more like its host's eggs; whereas in the case of the parasitized bird, it means its eggs will evolve to look less like its brood parasite's eggs.

They’re the victims of a “brood parasite” called the cowbird, which adds its own egg to their clutch, tricking another species into raising its offspring.

"The only place that we haven't found a brood parasite bird yet is Antarctica."

Perhaps the most infamous brood parasite is the common cuckoo.