I have been having a bird frequent my feeder that looks very odd. It is about the size of a robin, but has a huge beak with a hump on it. It looks like it might be molting. It also seems to have a tumor on it's back.
http://photos-d.ak.fbcdn.net/hphotos-ak-ash4/c0.62.432.287/401611_10150807328804243_680419242_9518639_2065080266_n.jpg
http://photos-d.ak.fbcdn.net/hphotos-ak-ash4/c0.62.432.287/401611_10150807328804243_680419242_9518639_2065080266_n.jpg