A couple of years ago we would occasionally toss snacks (toasted walnut pieces, unsalted peanuts in the shell) for them on our walks. We stopped for reasons I won't go into.
But they haven't forgotten, they still fly right up and land right next to us, sometimes swooping overhead close enough to feel the rush of air. I'm trying to teach them the waggly-fingered "empty hand no snacks" gesture.