A Northwestern Crow (Corvus caurinus) dives to attack a Bald Eagle (Haliaeetus leucocephalus) as it watches over its nest in Kirkland, Washington. The nearly full moon is visible in the background. Crows are often seen chasing hawks or eagles in flight, or repeatedly diving at them when they perched, a practice known as mobbing. Research is inconclusive, but scientists think this harassment helps to force the birds of prey to hunt elsewhere, ultimately reducing the threat to the crows and lowering competition for food.
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