A female rabbit is called a doe. A male rabbit is a buck. Young rabbits are referred to as kits or kittens. Wild European rabbits live in underground tunnels called burrows. A group of burrows is called a warren.
Rabbits are herbivores and survive mainly on grasses and leafy weeds. Due to this diet, rabbits consume large amounts of cellulose, which is difficult to digest. Rabbits therefore use hindgut fermentation, in which they have two different types of feces: hard droppings and soft, black pellets. When rabbits pass the soft pellets, typically during the night, they immediately eat them. This allows them to redigest their food and gain the most nutritional value from it.