My chicks are 3 weeks old. I have a bunch of different kinda of chicks.we have 1 chick that has started pulling tail feathers off of the others (we're pretty sure its our biggest Red Ranger). He has gotton our other 4 red rangers, 1 of our Rainbows (I believe its a rainbow) & has gotten 1 feather from 1 ISA BR. I just found this out this afternoon when we were cleaning ther brooder I currently have the "injured" seperated from the rest. I didn't want to come out to a carnivorous mess. Is this completely normal or is there aonething I should do?