These strange birds live in pairs, and but rarely associate, even in small parties. Their food consists of insects and various kinds of seeds, the former, according to Burmeister, being always obtained from the surface of the ground, over which they run and hop with great facility. Nor are their movements less adroit amongst the branches, from whence their most peculiar cry is constantly to be heard as they disport themselves from bough to bough. These birds are regarded with great respect by the Brazilians, on account of a very strange but prevalent idea that they never proceed with their building operations on the Sabbath, a superstitious fancy that we need hardly say has been frequently disproved, but has no doubt arisen from the unusually short time required by this species to complete its remarkable and elaborate home. "The nest of the Red Oven Bird," says Burmeister, "is usually constructed upon the branch of a tree, and occasionally upon house-tops, steeples, or similar situations. Both male and female unite in the labour of building, and form their nests of round pellets of mud, working each pellet firmly into place, intermixed with small portions of plants, until the foundation is some eight or nine inches high. On each end of this groundwork the birds proceed to erect a side wall of such a form and height as to give the entire mass the appearance of a half-crescent. When this foundation is quite dry a second wall of similar shape is erected within the first. This again is left to dry, and so the work proceeds until the mass has assumed the proper dome-like form, and is six or seven inches in height, eight or nine inches long, and some four or five inches deep. The interior of this remarkable structure (which sometimes weighs as much as nine pounds) is entered by an oval-shaped hole at the side, and is neatly and warmly lined with hay, cotton, wool, feathers, or similar materials. The eggs, from two to four in number, have a white shell, and are incubated by both parents. The first brood is produced early in September, and a second later in the season." * * * * * The GROUND WOODPECKERS (_Geositta_) are birds with slender bodies, long, pointed wings, and short incised tails; the slightly curved beak is triangular at its base, and nearly equals the head in length; the legs are of medium height, the outer toes short, and the claws small. THE BURROWING GROUND WOODPECKER.