I had a mixed group of 5 day old - 4 week old chicks all mixed together, silkies, Polish, bantam polish, maran's, Cochins, showgirls and one wellsummer. I was tired of them in the house and put them in an outdoor brooder with a heat lamp and access to a small area of yard. Food and water both inside and outside the little brooder, which measures about 3' by 4'. Both sun and shade, I catch them all and put them in their little coop at night. But. Early every morning for 2 weeks I would go out to find one dead baby. I chalked this up to survival of the fittest, because it was usually the smallest ones dead. Then I worried that they were drafty or smothering each other or sick etc. their poop was fine, not drafty in the coop, warm outside. I locked them in the coop on days cooler than 80. I went out of town and had a friend chicken sit for me. She encountered the dead morning chick too, but in the afternoon witnessed the wellsummer chick attack and kill another chick! when I got home I found a chick dead in the little run and still another dead baby in the morning. Is it normal for a 3-4 week old chick to kill other chicks? I've never witnessed any aggressive behavior out of any of them so was shocked at this. The morning deaths have stopped, but I'm down to 13 out of 40 chicks, all the bantams were killed or died, 3 out kf 4 of the showgirls and most of the silkies. Is it possible that the wellsummer was killing a chick a day and now has stopped because all the little ones are gone? Were they smothering each other. Or should I have kept them in the house? Are wellsummers little chick sociopaths??