Why are blackbirds black? One possible answer is that black is conspicuous against just about all of Nature's backgrounds. Blackbirds, like this flock of Red-winged Blackbirds and Yellow-headed Blackbirds, feed on the ground. Whenever a predator approaches, they take flight. Coming together quickly in a dense mass may confuse the predator and thwart its attempts to catch one of the birds.
More info and transcript at BirdNote.org.
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