I have two 6 month old rats living in the same room as my 8 week old rabbit. The rats are bucks from the same litter, very tame and friendly, never bite humans but they do fight with each other a lot, because that's perfectly normal. The rabbit is also a buck, very inquisitive and not at all nervous. Obviously their cages are separate and I let them out for free-roaming at different times but I'm just curious - do you think they could ever get along? I've heard of people keeping lots of different animals together - cats and dogs, cats and rats etc - but knowing them as I do, I think my ratties would feel threatened by the bunny and might try to attack him. Does anyone have any experience with this sort of thing?