How long can a crow hold a grudge? Crows at the University of Washington reacted to a mask for about 17 years – Futura-Sciences

November 9, 2026

5 min

How long can a crow hold a grudge? Crows at the University of Washington reacted to a mask for about 17 years
Spring arrives on the UW Seattle campus in April 2020. ©nieudacza

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