The wolf, which is in fact the ancestor of many domesticated breeds of dogs, is the largest representative of the _Canidæ_, although the typical wolf of northern Europe is much exceeded in point of size by those of certain other countries, the largest of all being the huge black wolf (_Canis lupus pambasileus_) of Alaska, which is almost as tall as an ordinary bear, and has a head of enormous proportions. Although many modern naturalists divide it into distinct species, the wolf has a circumpolar distribution, and in Asia ranges as far south as the Himalaya and the north-western frontier of India. From Great Britain, Denmark, and Holland the wolf has long since disappeared, and it has likewise been exterminated in northern and central Germany. But wolves still remain in Spain, in the districts of France adjacent to Germany, and in Poland and Russia, as well as in other parts of eastern Europe, while they are abundant throughout central and northern Asia. In the colder parts of their habitat, as in Tibet, where a black phase is common, these fierce Carnivora develop a thick under-coat of fur. With such an extensive range in the Old World, it would be only natural to expect that wolves should present considerable local variation in colour and size; and as a matter of fact this is actually the case, although the various local races are still imperfectly known. [Illustration] In North America the species is represented by the grey, or timber, wolf (_C. lupus occidentalis_), as well as by the aforesaid black Alaskan race. As regards colour, the ordinary American wolf is dark grey, becoming almost black on the back, with dusky patches on the shoulders and hips; but there is also a more rufous phase. The coyote, or prairie-wolf, is a distinct species, _C. latrans_. In Europe the favourite haunts of the wolf are wild and retired situations both in the plains and mountains; during spring and summer wolves go about for the most part singly or in pairs, but in winter they collect in parties or large packs, and when driven to desperation by hunger are the terror of the peasantry or the traveller, not only in Russia but even in some districts of France and Germany. The food of the wolf includes all animals that it can capture and overpower, as well as carrion, and even vegetable substances. Large game and domesticated animals form its chief victims, but in cases of necessity, rats, mice, frogs, and even cockchafers are not disdained. In pursuit of their prey wolves are practically untiring. The female gives birth during the spring, in some sequestered situation in the forest, to from three to nine cubs, which she nurses and tends with wonderful affection and care. THE WILD CAT (_Felis catus_)