To expand on your mention of crows. Not only do crows learn to recognize PEOPLE by their FACES, they teach their offspring to avoid/mistrust those same people.

To expand on your mention of crows. Not only do crows learn to recognize PEOPLE by their FACES, they teach their offspring to avoid/mistrust those same people. Those offspring teach their offspring. So the "grandchild" of the original bird learns to avoid a specific person. *(Note the documentary I watched with this revelation didn't follow any further generations. We don't know how many generations are taught this lesson.) Think about that for a minute. I don't recognize the people that live 2 houses away from me, these birds teach their young that SPECIFIC humans are dangerous. This isn't the study I watched, but it's close. https://www.discovermagazine.com/planet-earth/grudge-holding-crows-pass-on-their-anger-to-family-and-friends https://www.discovermagazine.com/planet-earth/grudge-holding...