I have 5 chickens and 3 rabbits. They are not housed together, rabbits live in their hutch and the chickens have their coop&run. I do let them out in the yard together.They all get along fine when everybody is out and about in the yard. But since rabbits are diggers, I find that the rabbits go into the chicken run area and dig large holes(actually they are more like tunnels) that I am constanly filling back in. I think they like the feel of the sand. Last year when we were building the run we didn't have the rabbits yet. And now thinking back when I had had 2 rabbits years back (but no chickens then ) they were not diggers, they had run of my yard during the day and they rarely dug holes. This spring/summer we are doing modifications to the yard so everybody can live happily( and have no escapees)-chickens, rabbits and turtles.