Amazingly, they can. Many birds recognise individual humans but they probably do this by using a variety of cues, including height, build, colour, clothes or ways of walking. Crows, however, can actually recognise faces.
This has been confirmed by experiments in which scientists put on various masks and then trapped a group of wild crows and fixed rings to their legs. After letting the birds go, they walked around recording whom the crows mobbed or scolded with their harsh, warning cries. The trapped crows, which had previously ignored these individuals, now reacted aggressively to anyone wearing the trappers’ masks, regardless of their size, clothes, or gait.

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