It really does depend on the cat. Take your cat out to be around the chicks and watch and see what happens. Initially I was not letting either of my four cats near the chicks, the German Shepherd, Rex guarded them and wouldn't let any cat near them either. I don't know if it was his contanstly jumping them if they got near them or what but after a while they lost all interest. I still used to keep the babies behind fenced run and would watch my younger, once feral, kitten try to chase them. But now, a year later, he nor any of the other cats bother the chicks or the chickens. I let my baby chicks start free ranging around the fenced run at a week old. Fenced by short picket fence any cat could easily jump but doesn't - nor do they show any interest in the chicks. At 6 weeks old the gate to the run is left open and anyone who wants to go out and free range is free to do so. Again, in one year, neither cat has bothered them at all. The other day one of my babies escaped the coop and I couldn't find it. My feral cat came up while I was out looking and I was sure it had killed the chick. I had to apologize to cat the next day when I found the dead chick floating in duck pool - turns out my ducks killed it. I have one cat, Morris, who truly seems to love hanging out with the chickens. He can be found sleeping with them, in coop with them, sleeping in nest box next to one. We call him Guard Kitty.