Litter training is a great idea for bunnies and can make your life a lot easier when clean up time comes along!! Rabbits are naturally clean animals and will normally choose a corner in their cage to go toilet in. Litter training is relatively simple... place a litter tray with some bedding and hay in the corner your rabbit normally goes in, place some dirty bedding in the litter tray and your rabbit should quickly pick up on its new toilet area. Rabbits will go toilet as they eat so it is important that wherever you are planning to place the litter tray that there is plenty of hay around for your rabbit to munch on. There are many corner 'rabbit' litter trays available at pet stores but I find these far to small for rabbits, I have purchased a number of large cat litter trays for Dustin and you may need something slightly larger for multiple rabbits. As I mentioned in the bedding post I am planning to use a mix of pine and carefresh bedding in the litter tray in order to get him use to using a litter tray but after that I may use more of the carefresh because I find it a lot more absorbent. Like most animals with rabbits the younger the animal the easier to litter train but it is not overly difficult to train an older rabbit and rabbits are overall pretty easy to litter train... well I hope so I will find out soon with Dustin!!! Ill attach some photos of the litter trays I have purchased for Dustin :)