July 21, 2017
Long Visit From Juvenile Brown-headed Cowbird on the Cornell Feeders
One thing sets apart this juvenile Brown-headed Cowbird from the other juveniles that have visited the feeder this year: it wasn't raised by it's biological parents! Instead, Brown-headed Cowbirds opt to lay their eggs a number of host species nests and let them assume the role of parent. This reproductive strategy is known as brood parasitism, and Brown-headed Cowbirds are extreme generalists in this category, having been known to lay eggs in the nests of over 220 different species!