I have 7 chickens in a 10x18 coop well ventilated we are currently working on chicken run but I’m not sure I’ll have chickens for it by the time it’s done, every other day I go out I’m down a chicken 2 we’re attacked one died from heat stroke and today another one was pecked to death I’m not sure why they are doing this there is absolutely no signs of bullying during the day it happens over night they have fresh food and water and smacks during the day I cook off there coop during the day I have places for them to get and climb on I have no idea why they are killing eachother I’ve had them all since they were chicks they got along find up until 2 weeks ago