I asked the same question about six weeks ago and have had my two bunnies living happily with my 14 hens very sucessfully. We have an outdoor area that is totally inclosed with hardware wire, under ground and over. The hutch is in the outdoor area. at first we didn't let the bunnies in the coop because the burrow all over and make a crazy mess in the coop. This made live difficult because we would have to keep the rabbits n theier hutch at night and let the girls out during the day and close up the coop.........finally we just leave everything open, let the bunnies dig......they are so happy, they were fat from living a life of eating and pooping in their hutch. They are happy and healthy now, dropped a bunch of weight and rarely get bothered by the chickens. We just fill in the floor of the coop once a week. It is wired under the ground, so this is actually helpful because it is a composting floor and the rabbits stir it all up. I think after a year, I will remove all the now composted dirt and chicken manuer and toss it in the garden, refill with dirt and start again. Sometimes one of the chickies will peck to steel a favorite piece of fruit or veggie, but basically they ignore each other. Life is good!