Crows have small brains so how can they remember who was nice to them?

Ok folks, this is the 3rd time crows come visit me ever since feeding them and letting one stand on my arm.

Crows have small brains so how can they remember who was nice to them?

Meanwhile my friend doesn't like them and she tried chasing them away once. They ended up pooping on her car. We tried exchanging each others' clothes. She wore my hat and lipstick and I ended up dressing like her. It didn't work. They still treated us differently. I was impressed they still recognized me. They hate her back, lol.

Crows and other birds have small brains. So how do they remember who was nice to them?

Crows have small brains so how can they remember who was nice to them?
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