The Ring-tailed Eagle (_Falco fulvus_, LINN.; _l’Aigle commun_, BUFF.) is the common eagle of Buffon, and, according to that author, includes two varieties, the brown and the black eagle; they are both of the same brown colour, distinguished only by a deeper shade, and are nearly of the same size: in both, the upper part of the head and neck is mixed with rust colour, and the base of the larger feathers marked with white; the bill is of a dark horn colour; the cere of a light yellow; the iris is hazel; and between the bill and the eye there is a naked skin of a dirty brown colour; the legs are feathered to the toes, which are yellow, and the claws black; the tail is distinguished by a white ring, which covers about two-thirds of its length; the remaining part is black. The ring-tailed eagle is more numerous and diffused than the golden eagle, and prefers more northern climates. It is found in France, Germany, Switzerland, Great Britain, and in America as far north as Hudson’s Bay. The White-tailed Eagle, Great Erne, or Cinereous Eagle (_Falco albicilla_, LINN.; _Le grand Pygargue_, BUFF.) Of this there appears to be three varieties, which differ chiefly in size, and consist of the following: the great erne, or cinereous eagle, of Latham and Pennant; the small erne, or lesser white-tailed eagle; and the white-headed erne, or bald eagle. The first two are distinguished by their size, and the last by the whiteness of its head and neck. The white-tailed eagle is inferior in size to the golden eagle. The beak, cere, and eyes are of a pale yellow; the space between the beak and the eye is of a blueish colour, and thinly covered with hair; the sides of the head and neck are of a pale ash-colour, mixed with reddish brown; the general colour of the plumage is brown, darkest on the upper part of the head, neck, and back; the quill feathers are very dark; the breast is irregularly marked with white spots; the tail is white; the legs, which are of a bright yellow, are feathered a little below the knees; the claws are black. This bird inhabits all the northern parts of Europe, and is found in Scotland and many parts of Great Britain. It is equal in strength and vigour to the common eagle, but more furious; and is said to drive its young ones from the nest, after having fed them only a very short time. It has commonly two or three young, and builds its nest upon lofty trees.