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I think the ikea one could work, if you could cut a hole in the top where the bunnies can’t get to, to post in the hay. I’m not sure if that could be done easily. If you had to hinge it away from the wall to fill it I think the hay might fall out the sides. And the gaps in the corners you could mesh to stop them getting their heads or anything stuck
I just need one on a much larger scale for the goat shed now :lol: