I've heard a lot of cats killing chickens..even full grown ones. My maine coon is afraid of mine, because her trying to stalk one of my hens ended in a rooster chasing her away. She's killed full grown rabbits, squirrels, snakes and a lot of birds.
I'm not too worried about her personally going after a full grown chicken, but I can easily see a feral cat try its luck at it.
I'm not too worried about her personally going after a full grown chicken, but I can easily see a feral cat try its luck at it.