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In page Red-winged blackbird:

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Virtually all of North America's raptors take adult or young red-winged blackbirds, even barn owls, which usually only take small mammals, and northern saw-whet owls, which are scarcely larger than a male red-winged. Accipiter hawks are among their most prolific predators and, locally, they are one of the preferred prey species of short-tailed hawks.[1] Crows, ravens, magpies and herons are occasionally predators of blackbird nests. Additional predators of blackbirds of all ages and their eggs include raccoons, mink, foxes and snakes, especially the rat snake. Marsh wrens destroy the eggs, at least sometimes drinking from them, and peck the nestlings to death.[2]