I've got a coop with 4 'cauanas in it, two 9m/o layin hens, one 4 m/o hen and one m/o roo. I decided that the 4 younger ones i had in a brooder in the house were ready to go outside into the coop with the other birds. One o' the older layers in broody and on the 2nd floor o' the coop settin'. So that left one layer, one younger hen and the younger roo.I figgered that since there was 4 new birds to introduce that there would be safety in numbers....WRONNNNG !!!! i put the new birds in the coop late evening and sat and wathced for an hour ready to rescure if/when needed. All went pretty well, no more than the usualy chest bumpin to establish order. I figgered all was well and left it at that and went in the house. Next morning all was still well and i left the house for the day. When i got home last evening i had one opf the 4 newbies dead, completely stripped of all feathers but curiously not a mark on it's body(stomped to death?).Two of the remianing 3 had HOLES pecked into the thier backs near their tails and thankfully the 3rd, a white splash had no marks at all on her. I took the 3 back out and filled the holes in the tow o' them with neosporin and put them back in the brooder in the house. Guess i jist gotta wait a few more weeks to re-intorduce these 3. This is the 2nd time i've had 'caunas kill one o' thier own. Why are they so vicious ? My Buff orps are serious about thier peckin order and lettin newbies know thier places but NEVER have they gotten muderous.