Also, our digestive tracts are too short to be vegetarian only. Cows have fermentation chambers in their gut to allow bacteria to digest the cellulose in plants to obtain more nourishment to be gotten from the food. We are designed to eat both. I would no sooner eat only vegetables, as I would eat only meat. A small bit of info for interest.
Rabbits are coprophagic.
That means that they eat their own droppings. They can tell the difference in the droppings. Particularly because of the lack of overkill on certain topics, which is usually present.