We have a mixed flock. Most are shades of brown and/or black (GLW, EE, BR, etc) but three are Delawares. I love these hens, they have great personalities, but they are a bit aggressive and are pulling the feathers from the vents, backs and necks of the other chickens. They stick together when they range, and don't seem to pick each others' feathers at all. Is this a Delaware thing, or perhaps a white bird in with other colors thing? I've sat and watched, and two of the three Dellies are the feather pickers. The other birds don't seem to be doing it. They're causing quite a problem with bare rumps. The two pickers are in a dog crate right now, and hopefully they will settle down on re-introduction after a week or so. But I'm looking at my chick order for spring, and while I'd really like more Dellies, I won't get them if they're going to be a problem. These three are from McMurray, if it makes a difference. Any thoughts?