so sorry.One of my 2 3month old Ameraucana chicks was killed yesterday by one of my 6 month old pullets after being slowly introduced and having no issues for several days after leaving them together 24/7. Now I have the surviving chick back in the house alone. I'm not sure what to do. Doesn't she need a companion?
good luck
Sometimes chickens can be a mystery. Our vet told us that sometimes chickens turning suddenly can mean that they know one is sick. We had a bird go from top to bottom of the pecking order and inside of a week it died from an undetected infection.