Two sister baby Flemish rabbits. We started out by letting them run loose in the house (not in the bedrooms) and then would herd them back into their pen at night (3 foot by 6 foot pen) or when we left them alone. They just hated to be forced into the pen. But then one night the dominant sister beat up her submissive sister…we could hear the thrashing and then when we came to look at them a couple of tufts of rabbit fur. We decided not to pen them….they have free run of the house, except for the bedrooms. We leave the pen door open 24/7 and now since they are not forced in the pen, they often go there on their own. We’ve had a chewing problem. A solution has been to place cardboard boxes in the living room..they love to play with them, push them around, jump in them, and eat them! I’ve had to rabbit proof what few electrical wiring there is. One of them jumped up on my computer desk one night and chewed in-two the wires to my keyboard, mouse, and cell phone charger wires…$90 to replace the wires! Also, I’ve placed pieces of 2″X4″ wood at several places in the living room. They like to chew on the wood. The wood is not varnished so I think it tastes better than the furniture, also they know that if they chew on the wood pieces they won’t be scolded as they are when they chew on the furniture. Never had baby bunnies before. My previous adult rabbit did chew, but no where as much of a problem as the babies. The babies weigh 10 pounds each now.