I have four chickens and two siamese cats, when the chickens were about I week old I took them outside in the yard and watched them very closely, I noticed the cats watching them. One of the cats was hiding under a nearby toy, I looked over and saw that wild look in his eye, he started running toward the chicks, so I tackled him, ever since the cats have not bothered the chickens, even when a chick fell off a ledge next to the cat. Now my chickens are 2 months old and I have been keeping them outside, the cats will often come next to the cage and watch the chickens. I decided to test it so I let the cat in under close supervision, the cat hid under the coop and the smallest chicken came over and started chasing him and trying to peck his tail,it was really cute, the cats seem to be scared of the Chickens now.