My friends and I share six chickens. They live at my friends house as they have the coop on their property. The other day, my friend found a large rat in the coop and they've noticed some droppings. The chickens have moved outside and haven't touched their food. They've been eating the goat food. So today, they are going to close up the hen house door so only a rat can get through, and put some snap traps in the coop to catch the rats. Is there anything we can do to keep the rats out? The coop is kept clean, the food is in a hanging feeder (though it's low enough for a rat to get into so we we'll have to raise it). The property boarders a swampy area and I know they live out there because I've seen their tunnels. This happened last year with my friends' last flock. The chickens moved out and got so stressed, they started eating their eggs and then my friends had to cull the whole flock. Very sad. I don't want that to happen to my girls. They're only 22 weeks and just started laying a week or so ago. Any suggestions? Thanks!!