Lots of contenders here for 'worst bird' – American Crow, House Sparrow, Yellow Warbler. Some people hate Brown-headed Cowbirds for their uncanny ability to threaten the populations of the critically endangered Kirtland’s Warbler among countless other passerine species by laying their eggs in the other’s nest. Personally, I rather like BHCO. I find it fascinating that they’ve evolved the ability to mess with other birds so badly. And let’s be honest, Kirtland’s Warbler wouldn’t be quite so alluring if it wasn’t on the precipice of extinction.
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