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female Brown-headed Cowbird

One of the most common pieces written about Brown-headed Cowbirds is their brood parasitism - or the fact that they lay their eggs in other birds' nests; they don't build their own nests. Apparently most other birds don't recognize the cowbirds' eggs as foreign, so they leave them alone. Some do however. Larger birds that see them as foreign often pierce the shells, or toss them from the nests. The smaller Yellow Warbler though, which is not large enough to toss them aside, instead builds a new nest on top of the old one. This delays their broods' development, but removes the cowbird chicks from the mix.

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Photo Taken

Date:Apr 28, 2013
Location:Reifel Bird Sanctuary
City:Delta
Province/State:BC
Country:Canada

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