My opinion that cats are different like most critters. Some are good with birds and chicks and other want to kill them. Some cats would probably kill even a large fowl bird if they could. My suggestion would be to put the birds where they are safe from the cat. Just beware that someday the cat could get out somehow and go for your birds. I don't free range anymore due to losses from predators in the past but my land is mostly open pasture so no place for the birds to go and hide. A predator can still get them when hiding. There are some posts on BYC of people free ranging their birds and think that the birds have plenty of hiding places until the predator kills one in its hiding place. Good luck...