Rabbits are herbivorous animals and their diet mainly consists of hay, fresh vegetables and fruits, and pelleted food. Timothy hay is the best choice for adult rabbits while alfalfa is often fed to younger rabbits because of its high calcium content. Fresh vegetables like carrots, lettuce, kale, parsley, and spinach are also important in their diet as they provide important vitamins and minerals. Fruits like melons, apples, and berries can also be given as treats, but should be given in moderation due to their high sugar content. It is important to remember that rabbits have sensitive digestive systems and sudden changes to their diet can cause health problems.