Birders are never to happy to see brown-headed cowbirds. They are brood parasites, laying their eggs in the nests of other birds. Its not uncommon to see a tiny common yellow-throat warbler trying to feed an enormous baby cowbird almost double the parents size. The female cowbird will usually push one of the host birds eggs out, then lay hers in its place. Some birds catch on tho the cowbirds and will either eject its egg, or rebuild a new layer of nest over the existing eggs and start all over. They prefer open cupped nests, like those of the yellow warbler.
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