Our rabbits have been visiting the chicken tractor and eating the layer feed. I was concerned about them getting too much calcium from that feed so I closed the lower door to the tractor and opened a door up top that is about 3 1/2 feet from the ground. (with no ramp) I opened the upper door the other day and saw bunny berries inside. I thought they were left from before when the rabbits would enter from the ground and walk up the ramp. Was so proud of figuring out a simple solution. BUT... I saw one of the bunnies jump from the ground, use the hardware cloth, which covers the bottom of the tractor, as a bounce platform and end up in the upper level of the tractor. So much for my fix on keeping the bunnies out of the layer feed. I knew the chickens could jump up and get in but had no idea the bunnies would do it. I am learning just how clever these critters are.