I definitely disagree that a caged rabbit is a happy rabbit. Rabbits love to roam and eat grass all day, far away from commotion, with room to run and places to hide. I had free range rabbits, but I live out in the jin weeds so I did not worry as much about neighbors and people. Predators and roads can be an issue, but trust me, mine never would have picked a cage even if it can offer predator protection. A happy medium is a pasture with a fence apron on the inside and out if you can, to keep the rabbits from digging out and the predators from digging in. You can just let them loose, but some males will leave, and you can count on a predator loss here and there (and they will breed like rabbits). Will not be as friendly either. The choice depends on what your goal are with the rabbits. Mine were for enjoyment, I love to watch free range rabbits out in the yard. It will not work for everyone, though. Besides the occasional male, mine all stayed in the yard and would eat apples and treats out of my hand, but I made pets of mine. I do not know if you could train them to sleep in one place at night. I bet it would not be as easy as getting chickens to, but it sure would make them a lot safer at night.