snow leopards were the hardest until I decided to do their exhibit a little at a time. I left room to place more foliage, rocks, and hills, when the little bugger was happy I gave him a mate and then sat back and watched. If their happiness began to fall, I would sell the pair off and buy a new pair, since the exhibit was the way they liked it, it worked fine. Black leopard, are one of my favorite, they don't give me any problems at all. laura