Who’s Your Mamma?

This male yellow warbler was feeding an angry brown-headed cowbird chick several times his size at Tinicum NWR in Pennsylvania.

Birds have all sorts of crazy antics and nesting behaviors—from multiple female anis who all lay all their eggs in the same nest and raise the chicks communally, to swallows who use nothing but mud and spit to build their nests, and more, but in my opinion, one of the most fascinating behaviors of all time belongs to a group of species called cowbirds, who leave the dirty work to over a hundred other species.

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