Went out side to check on the animals to find 6 dead mini Rex and 1 dwarf in the hutch I had put them in last night . They were living in a pen attached to a barn . Another mini Rex and the dwarf both seemed to have runny poop a few days ago and I took it as they weren't used to living on the ground as I got them from an auction 2 weeks ago . I brought them into the barn and both seemed to have gotten better, so with the nice weather I put them back out in the pen . I came home from the auction at 7 to find the mini Rex dead . Soo I moved them into a big 6 ft rabbit hutch . Now the hutch was left open as it wasn't in use . I opened the house part to find a young opossum sleeping in there. I cleaned all the straw and his poop . Could they have hot something from him ? Or could it be heat stroke as it's very hot here today ? I have the top covered for shade for them . The last rabbit was goin as I got out there I heard it screaming . It wasn't using it's back legs . There mouth was all wet .......Help!!