Crows that hold grudges

Smart Crow in the City

Crows are often name-checked among the brainiest of birds, and rightly so

These black feathered fliers have come up with ingenious survival hacks, including using cars in traffic to help them crack hard-shelled nuts, and making tools to help them get otherwise out-of-reach food. More recently, they have also been credited with a most unusual animal skill: the ability to recognize individual human faces, which means these guys can (and do) hold grudges. The moral of the story? Never cross a crow.

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