Yes, rabbits can be trained to use a litter box. By gradually introducing the litter box to your rabbit's living space and placing some of their droppings in it to encourage them, along with positive reinforcement such as treats or praise when they use the litter box, rabbits can learn to use it consistently. It's important to use the right type of litter that is safe for rabbits and to clean the litter box regularly to maintain good hygiene. With patience and consistency, most rabbits can be successfully litter trained.