My rooster will go up behind a hen and scratch a foot while one of his wings are down (feather spread out). Not only that, but while he scratches his foot he will turn towards her and coo. I don't know if this is mating behavior, but I have a feeling that it is. This is the first year I've had a rooster, so I am new to male chickens. He is nice to me because he sees me more than a few times a day.