Ok thank you. the black birds might be starlings but I am not 100% sure. there was a period of time when I had NO animals at all in my barn and there was no feed and they still stuck around. I think scraps of food is just a perk for them lol. I will look up the feeders and traps. And thank you for the links!
Barns are just such a great, safe place for birds to roost! That must be the main attraction for them.
Just another thought-- if you are open to the idea, you might invite a falconer (falconers can fly other birds besides falcons) to your barn for some raptor training and perhaps hunting. Even just a few visits might be enough to ward them off!