Crows can memorise the face of a person who wronged them, hold the grudge for as long as 17 years, and teach it to their own chicks and flockmates, so that birds who never even saw the original offence will still harass the person on sight.
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Almost every neighbourhood in North America has crows in it. Big glossy black birds, one of the most successful adaptations to human life any wild animal has ever managed, sitting in trees and telephone lines and city parks, watching people with what looks from underneath like ordinary bored attention. What most people who share their neighbourhoods with them don’t quite realise is that the birds are, in a very specific and measurable sense, watching. And, if you do the wrong thing to one
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