having been attacked by a bird recently, this is wildly fascinating
Wild crows can recognise individual human faces and hold a grudge for years against people who have treated them badly. This ability – which may also exist in other wild animals – highlights how carefully some animals monitor the humans with whom they share living space.
Field biologists have observed that crows seem to recognise them, and a few researchers have even gone to the extreme of wearing masks when capturing birds to band (or "ring") them, so that they could later observe the birds without upsetting them. However, it was unclear whether the birds distinguish people by their faces or by other distinctive features of dress, gait or behaviour. To find out,