The HAMMER-HEAD, or SHADOW-BIRD (_Scopus umbretta_), is an African species, and represents a family possessing a compact, almost conical body, short thick neck, comparatively large head, and broad, much-rounded wing, in which the third quill is longer than the rest, and a medium-sized tail, composed of twelve feathers. The high beak is longer than the head, straight, compressed at its sides, and slightly bent at its tip. The feet are moderate, with toes but slightly connected. The head is decorated with a bushy crest, and the thick streaming plumage is of an almost uniform umber-brown, with the under side of a lighter shade. The quills are glossy and darker than the back, and the tail-feathers are enlivened by a broad, purplish brown band at their extremities, and narrow irregular lines of the same at their roots. The eye is dark brown, the beak black, and the foot either black or blackish brown. The length is twenty and the breadth forty inches; the wing measures eleven inches and two-thirds and the tail six inches. The female differs in no respect from her mate. This remarkable species inhabits all the central and southern portions of the African continent, including Madagascar; and is also met with in Southern Arabia, but is nowhere numerous. "The Hammer-heads," says Layard "are strange, weird birds, frequenting ponds, marshes, rivers, and lakes, flitting about with great activity in the dusk of the evening, and preying upon frogs, small fish, and similar fare. At times, when two or three are feeding in the same small pool, they execute a singular dance, skipping round one another, opening and closing their wings, and performing strange antics. They breed on trees and rocky ledges, forming a huge structure of sticks, some of them of considerable thickness. These nests are so solid that they will bear the weight of a large heavy man on the domed roof without collapsing. The entrance is a small hole, generally placed on the most inaccessible side. The pure white eggs are from three to five in number. On my late friend Jackson's farm, at Nels Poort, there is a singular rocky glen between two hills. In this spot a beautiful permanent spring, called 'Jackal's Fountain,' takes its rise. Of course, in consequence, there are a few wild almond and other trees; indeed, the place is a little oasis amid the barren mountains, and a favourite resort for hyænas, jackals, leopards, and other wild animals. On the ledges of the rocks in this secluded spot a colony of Hammer-heads have built for years. Some of the nests are quite inaccessible, whilst others can be reached with a little trouble. I counted six or eight within fifty yards, all exhibiting the same form and structure, and some of them containing at least a large cartload of sticks. About some that I visited I found brass and bone buttons, bits of crockery, bleached bones, &c. Mr. Jackson told me that if a 'tottie' lost his knife or tinder-box on the farm, or within some miles of the place, he