I would like to get a few egg laying New Hampshire red hens to get fresh eggs, and keep the ticks and ants down around the house. How ever I am concerned our 20 lb, 7 yo red tabby will kill them. He hunts mice, chimpmunks, snakes. I know as chicks I will need to keep him away from them. But do you think the chickens once full gown can be safe with him around?