Originally Posted by
Tom Barry
Birdie has attitude! Well done. I'm pretty sure that is a brown-headed cowbird. Interesting species. They are called "brood parasites," because they knock one (usually) egg out of another species' nest and plant one of their own, which is then raised by the unwitting foster parents. I've read that scientists figure this behavior evolved because the birds originally followed bison herds on their wanderings, eating what the bison stirred up, and simply didn't have time to raise their own offspring.