I just finished building a new nest box for my chickens (the first ones wouldn't lay inside the coop, and they taught the habit the next generation). Wiggles the cat routinely occupies a cubby as his own personal bed. The chickens do not appreciate this, and there's always a lot of fretting and squalking! They don't realise they could chase him out easily if they tried. He's a heavy sleeper, but when he's awake Wiggles is a terrible coward.