Although so famous as a digger of extensive underground dwellings, Nature does not appear to have specially built the Rabbit for this purpose; but where the soil is light the efforts of many generations of associated workers have resulted in a system of burrows both extensive and complicated, with bolt-runs as emergency exits and stop-runs for nursery use. Although it prefers the light sand of the dunes covered with Marram-grass, or a sandy heath overgrown with furze and heather, it will on occasion drive its tunnels into firm loam or dry clay; it has been known even to burrow deeply into a surface seam of coal. The forepaws are the principal burrowing tools, the loosened earth being thrown far back by the kicking of the hinder feet. Where stones come in the way that cannot be loosened by the paws, they have been known to be removed by the teeth. These tunnels are about six inches in diameter, increased locally to a foot to provide passing places. The residental quarters are always blind chambers leading from the main passages. The adult Rabbits do not indulge in bedding materials but rest on the bare soil. The does, however, make beds for their young by denuding their own under parts of fur. These tunnels are frequently made use of by other animals, if necessary, by enlarging the passage to admit their larger bodies. When Rabbit-earths are ferreted they sometimes yield more than Rabbits: a Fox, a Cat, a Stoat, with several Rabbits and Rats, have been driven out of the same earth. Where the Rabbit finds the ground too hard or too wet, it contrives to do without tunnelling underground, making runs under the heather, furze, or matted herbage. Such exceptions are known to sportsmen as Stub-Rabbits or Bush-Rabbits, in the belief that they are a separate species. Occasionally, too, the doe will follow the example of the Hare, and make a nursery "form" in fallow land or among the growing turnips. The Rabbit is almost exclusively a vegetarian, its chief food being grass and the tender shoots of furze; but in the vicinity of cultivated land they devastate the crops and inflict serious loss upon the farmer. The exception to a vegetable diet is found in its occasional indulgence in snails. Wherever there is sufficient food and his enemies are not too oppressive the Rabbit has extended his range to the most out-of-the-way corners of these islands. A century ago it was a scarce beast in Scotland, but it is now to be found in abundance up to the extreme north. It is found also all over Ireland. Its chief enemies, in addition to man, are all the members of the Weasel family, the Owls, and the Hawks.