seems like the runts are the most aggressive. i guess they're trying not to look weak because they know they're losing their place in the pecking order. If you don;t want to cull you need to separate him and either keep him isolated or keep him with older chicks that won't get picked on by him.Amerucana chick behavior ! Has Anyone out there ever seen a severely aggressive amerucana chick? I've got a 4 week old that is literally attacking every chick that walks by him/her and he's the runt in the nursery as I call it! I can't figure him/her out. I've just never seen one this youg and aggressive it's so bad ill either have to cull him or pen him up seperate he's literally attacking the back of their necks pulling feathers and the down feathers causing the others to bleed! I hate to cull him!