Vets believe that high fibre is most important when recommending a rabbit food*. Wild rabbits mainly eat grass, which naturally contains 20-25% fibre and rabbits digestive systems have evolved to need a high fibre diet. Supreme has raised the levels of fibre in Science Selective to 25% so you can provide your rabbits with an even higher fibre, tasty diet that will help to keep them in the very best of health, naturally.