These Eagles inhabit the whole of South America, frequenting both the forests near the coast and such fertile spots as are occasionally found upon the barren steppes; but districts near rivers appear to be their favourite resorts. According to Schomburghk, they are easily recognisable by their loud cry, and by the effect of their snowy plumage, which acquires new beauty by contrast with the deep blue sky under which they wheel their rapid and varied flight. When about to perch they select the summit of a lofty tree, and often linger for hours together upon the same branch, almost motionless, or amusing themselves by playing with and exhibiting their flowing crests in a variety of positions. We learn from the Prince von Wied that they subsist principally upon opossums and monkeys, but will also devour a great variety of small quadrupeds and birds. The capture of the Crested Brazilian Eagles is attended with considerable difficulty, and their eyries are almost inaccessible, owing to the great height of the trees upon which they are built. It would seem that these birds are by no means inferior to their congeners in courage, for the Prince von Wied mentions that the specimen he obtained, though it had been shot through the neck by a large arrow, resisted boldly, both with beak and claws, when he attempted to take possession of it. THE HARPY EAGLE. The HARPY EAGLE (_Harpyia destructor_) is the most formidable of all the Eagles found in South America. The body of this bird is powerful, its head large, its tail robust and of considerable length; the wings, on the contrary, are short and blunt; the beak is unusually high and strong, very decidedly rounded at its summit, and sharp at the edges, which bulge outwards below the nostrils, and form a tooth-like appendage; the feet are stronger than those of any other Bird of Prey, the toes are long, and armed with very long, thick, hooked talons; the tarsi are partially covered in front with feathers, the bare places being protected by large horny plates. The plumage, which is soft and rich, is prolonged into a large, broad crest at the back of the neck; the head and nape are grey, the crest, and entire back, wings, tail, upper part of the breast and sides of the rump, dark slate colour; the tail is ornamented with three white stripes; the lower portion of the breast and rump are white, the belly and legs are also white, the former spotted and the latter streaked with black. The beak and claws are black, the legs yellow, and the eyes reddish yellow. In the young bird all these markings are indistinct; the feathers on the back are striped with grey, and those upon the breast and belly spotted with black. Tschudi gives the length of this species as being three feet two inches, that of the tail being one foot one inch, whilst according to Burmeister its size exceeds this measurement. The middle toe is three inches, the hinder toe one inch and a half long, and