We have six chicks (two easter eggers, one welsummer, one cuckoo maran, and two black sexlinked). They are being kept in a 24 by 36 inch pen, with plenty of starter feed, fresh water, a comfortable heat lamp, bedding, and some toys to peck at (a glass bottle, some toilet paper rolls, and a feather duster hung on one wall). They were all doing just fine together until today, and now one of them won't stop pecking the other chicks in the vents! It's such a shame, because she's my favorite chick. I seperated her in her own box, but she keeps chirping loudly and trying to jump out! I let her back in with the other chicks a couple times to see if she'd learned her lesson, but she immediately makes a beeline to peck them in the rumps, and they scream in pain!! How can I get her to stop?! It just breaks my heart! She's not the only one pecking, but the others don't seem to cause any pain to each other.