Before we got chickens, my family and I visited a farmer we know. We were all hanging out in the barn, his free range chickens (banties and standard) were wondering here and there, in and out. He has a number of cats also, and a huge Mastiff dog. Anyway, I had just asked him if the cats ever bother the birds, and he said no.
Well, in a flapping running flock, the chickens hurtled into the barn, half-grown gray cat in their wake. The cat decided her job was done, and climbed into the loft to peer down at us. I really think she was saying, "See! I can catch them if I want.. maybe another day!" It was SO funny. No, she didn't harm the birds, and none of the farmers cats ever had (or the giant dog), but clearly she thought they were fun to chase. Btw, the standard rooster was bigger than she was, and he too took off running. They have a number of cats there, and also a free range rabbit!
I think you CAN have chickens and cats together. Lots of people do (think of farms with barn cats and free range chickens). I'm sure any cat would go after a baby chick, however. My four cats are avid hunters also, and bring in 'presents', or leave them around the yard to decay (yuck and yuck!), but so far they have completely ignored the chicks both when they were inside, and in the brooder in the garage. Better safe than sorry, though! We don't let the cats around the chicks when both are loose.
Cats are funny creatures, though. I think somehow they make some sort of distinction. Our guinea pig is good sized, but no bigger than some of the prey they have brought home. However, she can be loose in the house, and no one bothers her at all (cats or dogs).
-Meghan