The GIANT WOODPECKERS (_Campephilus_), a group comprising the largest members of the family, inhabit America. These birds are characterised by their powerful body, large head, and long, thin neck. Their beak is long, straight, and strongly formed; their feet muscular, and the tarsi unfeathered. Of the toes, the outermost of the hinder pair exceeds the rest in length. The wings and tail are long, the third and fourth quills of the former being the longest. The plumage is black, marked with white. The feathers on the head form a crest, which in the male is of considerable size, and of a red colour. [Illustration: THE EUROPEAN BLACK WOODPECKER (_Dryocopus martius_).] Two species of Giant Woodpeckers are worthy of special notice, named respectively the IMPERIAL and the IVORY-BILLED WOODPECKERS. THE IMPERIAL WOODPECKER. The IMPERIAL WOODPECKER (_Campephilus imperialis_) is almost entirely black. A stripe on the shoulders, the tip of the hinder quill, and the lower wing-covers are white, the latter spotted with black on the exterior edge; the crest of the male is scarlet, and that of the female black. This species is above twenty-five inches long; the wing measures twelve and the tail nine inches. THE IVORY-BILLED WOODPECKER. The IVORY-BILLED WOODPECKER (_Campephilus principalis_) is also black; and the centre as well as the hinder quills are white; the lower wing-covers are striped with black; and the white lines on the shoulder extend to the sides of the head. The eye is bright yellow, the beak as white as ivory, and the foot greyish blue. This bird is twenty-one inches long, and thirty broad; the wing measures ten inches and a half, and the tail seven inches and a quarter. The Imperial Woodpecker inhabits the mountain tracts of California, as far as the boundaries of Mexico, whilst the Ivory-beak frequents the forests that extend along the Mississippi to the Ohio. We are but little acquainted with the habits of the first-mentioned bird, but are indebted to Audubon for a most graphic description of the life and habits of the Ivory-beak.