A few bushtits on a feeder. The long part of the feeder was to accommodate the woodpeckers and give a place where they can support their tails.
A FEW???!!! I'd say a conflagration, a congestion a confluence of bushtits. (To my American ears it sounds vaguely rude.)
Oh my!!! I thought I had a lot of Long Tailed Tits feeding here but I've never has as many as your Bushtits. They obviously really enjoy suet!!