We have extablished a rabbit sanctuary and rescue on our land in Blandville. For the first 6 months, we did not use any cages or fences and we only lost a couple of rabbits. When we reached in excess of 50 rabbits, we decided to contain them in a 3,000sf fenced area but then we attracted predators so we fully enclosed the area with fencing and netting. Now we are losing as many as 10 rabbits a day to sudden death and we cannot figure out what is causing this. They appear to be healthy in the morning, they become sluggish later in the day and then just drop over dead before our eyes. A few have been bloated and a few have been thin but most have had a normal appearance with no outward signs of trauma or gastric distress. What can we do to identify and eliminate the cause?