Our bullies here in London are ring-necked parakeets. They are the most bad-tempered birds on the feeder, preferring to peck at each other, and other birds, than to actually eat. I keep one feeder with a cage over it to give the smaller birds a chance. Luckily they only come mid morning and late afternoon, so again the other birds get to eat in peace.

Spring and early summer we have breeding starlings who also cause a commotion on the feeder, but that is more of a good natured scrum, they eat very fast and disappear in seconds.