I have two rabbits who are siblings - a boy and a girl. Both are neutered. They have a triangular corner litter tray which i fill with a mixture of natural recucled cat litter and clay. In the winter they live in an indoor hutch with the same litter tray, and they use it without a problem. When they go outside however in a two-storey hutch Poppy the girl promptly throws all litter out of the tray into the hutch. It makes a big mess in the cage which they then have to sit in and they still use the tray without litter in, making it very messy smelly and unhygienic, attracting flies. I have tried everything I can think of, but I just don't know why she does it! Any help much appreciated as it is becoming a problem.