See, we got a crow family that makes a nest in the neighbor's backyard every year. The thing about crows is, they are frighteningly smart. And they remember if a person does something good or bad for a crow, and they pass that info on to other crows....
Well first year we moved in, I rescued one of the fledgling babies from a lawn mower and set her under our little wild rose bush were she would be safe. Mom and dad were watching the whole time squawking up a storm, so I made sure to leave some food out as a peace offering so they would know I wasn't trying to steal or harm their baby. She got much better at flying by the next day and was hoping around just fine with her fam a couple weeks later, looking like an ungainly little goth teenager lol. Since then I've left occasional food out for them and i will greet and talk to them if they're hanging around. How much a crow can understand of that I have no way to measure, but they're at least parrot smart, and they have definitely figured out that I'm one of the nice people.
They repay me by guarding the flock. Last year I transferred the chicks outside at about 4 weeks, tired of the mess and noise in the house already after they out grew their brooder. Didn't even think about the possibility of the crows being a problem. Lo and behold, they started watching after the little chicks, would give them alarm calls if they saw a cat or a dog near by, and the one time a hark showed up they mobbed it non-stop for a week before it gave up and left. I haven't had to worry about aerial predators since. A little kindness and some bribery recruited me a pretty awesome protection detail lol.
Wow, that's awesome!! I need me some friendly crows.