[rossdavidh]

I think crows (and grackles, and other urban birds) have already changed their behavior in lots of equally big ways, to take advantage of where we leave food scraps, etc. The only difference in this case is there's some planning. If we don't plan it, it's not like they retain their natural behavior. Urban raccoons, possums, grackles, crows, etc. do lots of things on a daily basis they would never do if not in a city.

[major505]

I used to work in an office in front of a MacDonalds.

The pigeons wold go in the trash and take fries to eat.

There, I witnessed the fattest pigeon ever. The thing was so big, that it cold have a lifebar over his head.

[retox]

In the train station near where I used to live there were a couple of pigeons which learned to simply lie on their backs on those plastic deterrent spikes. They looked quite comfortable.