I am new to bird behavior but greatly enjoy watching them. I live in an apt. and on my balcony have a large platform feeder and a suet ball feeder. All the many birds get along well except the one robin whom I have named Thug! He goes after every bird except ones his size, like the pileated woodpecker. After he eats, he sits in the platform feeder keeping other birds away. If any comes near, he flies at them. He also doesn't seem too smart - all the other birds use the suet feeder but he can't figure out how - he tried a few times and there was a great flapping of wings. He didn't seem to be able or know how to grasp the frame. Since I am new to birds, I wondered if his behavior is common? Thanks.