Summary
Brood parasitism is a strange and fascinating behavior that we see (in one form or another) in several hundred bird species.

This is where a female lays an egg in the nest of another bird. The parasite female flies away and never sees her offspring. The host bird or birds are fooled into raising the foreign chick as their own.

Learn about which types of birds use this breeding strategy, including cuckoos and cowbirds.

We’ll discuss the various tactics used by both the parasites and their hosts in this evolutionary arms race. And we’ll get into some ins and outs of the evolutionary process in these birds.

Links of Interest

• Video of a cuckoo parasitizing the nest of a parrotbill

Link to this episode on the Science of Birds website

Errors and Clarifications

• At 07:38, I say that the only obligate brood parasite bird species in North America is the Brown-headed Cowbird. But the Bronzed Cowbird (Molothrus aeneus) lives in Mexico year round and breeds in some southern American states (AZ, CA, NM, TX, and LA).

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