Research on the behavior of crows reveals they're keen observers of death among their own and gather near a corpse as though they're attending a funeral. It’s already known these birds recognize individual human faces, and are able to pass down to their young knowledge about who is their friend and who is their enemy. Their latest experiment involves carrying a dead crow around Seattle's parks and recording how other crows react to the human being as well as the bird's corpse. They discovered the watching birds used specific noises and gathered in flocks over the deceased, a type of behavior called mobbing. Crows have evolved to have these complex social relationships according to Swift
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