Depends on the cat! Are these your spoiled pets that would rather eat kibble than chase a big ol' bird or are these feral cats from God knows where that are skinny and would try to eat anything? In my experience the chickens tend to be too big for most cats to want to bother but that might not be the case with bantams or with particularly determined felines. (My first cat would kill fully grown wild rabbits and drag them home. SIGH.) Good luck either way.