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bjjohns said:This isn't really a rabbit pen so much as it's a rabbit tractor:
http://www.backyardherds.com/forum/uploads/7104_rabbittractor_s.jpg
It's 5'x10' and the bottom is 2"x4" welded wire. The sides are 2' chicken wire. We put the rabbits in at 3-4 weeks of age. It gets moved 2-3 times a day. You have to be careful to not put it over holes when the rabbits are still really small.