hay?

I have two rabbits as well as my cats so I have hay around the house. Usually I put some hay for the bunnies in their litterboxes that are outside of their cages as well as some inside the cages. Lately, I have noticed that Nemo and Mercury occassionally like to munch on the hay. This won't cause them any problems will it?

I wouldn't think so. Many cats enjoy eating grass, and hay is just dried grass. When I had my bunny, Tailer liked to nibble on her hay from time to time. It never caused any problems with him.