These characters are derived, first, from their completely plantigrade walk, the whole sole being at all times closely applied to the surface on which they tread; secondly, from their claws, of which they have five on each foot; thirdly, from the extreme shortness of their tail; and lastly, from the form and arrangement of their teeth. These consist of the usual number of incisors and canines, the latter being in general very robust, and of a series of molars, which, when complete, amount to six on each side in each jaw; the posterior three having flat and expanded surfaces surmounted by broad and blunted tubercles, and lying closely in contact with each other. Between them and the canines exists a considerable space, which is or should be occupied by three smaller and obtusely pointed teeth; but this number is seldom found entire, one or more of them being generally absent, and the series being thus rendered incomplete. The Black Bear of America is distinguished from his fellows, and more especially from the brown bear of Europe, which he approaches most nearly in size and form, by few very striking external differences, except the colour of his fur. His forehead has a slight elevation; his muzzle is elongated, and somewhat flattened above; and his hair, though long and straight, has less shagginess than that of most of the other species of the group. In colour it is of a uniform shining jet-black, except on the muzzle, where it is short and fawn-coloured, becoming almost gray on the lips and sides of the mouth. This, however, it should be observed, is the character only of the full-grown animal: the young are first of a bright ash colour, which gradually changes to a deep brown, and finally fixes in the glossy black tint of mature age.