Rats, marmots, snakes, and insects are greedily devoured by the Mouse Buzzard, yet, as its name indicates, _mice_ constitute its favourite diet--indeed, so large is the number eaten by this bird, that, according to Lenz, a family of five consumes no less than 50,000 of these destructive animals in the course of a year. We will not attempt to include the next generation in this calculation, or our readers would be involved in a sum as intricate as that with which we are all familiar, respecting the nails in a horse-shoe; if, however, we take into account that the Mouse Buzzard attacks and kills all kinds of snakes, whether poisonous or not, we shall be able in some measure to estimate the very valuable services it renders to the human race. The generally-received impression that this species is proof against the venom of serpents is incorrect, as has been proved in a variety of instances. THE RED-WINGED OR GRASSHOPPER BUZZARD. The RED-WINGED or GRASSHOPPER BUZZARD (_Poliornis rufipennis_) is a small lively bird, inhabiting Central Africa. This species is recognisable by its long, powerful, but slightly curved beak, and over-hanging cere. Its pointed wings, in which the fourth quill is the longest, reach almost to the end of the long tail; the legs are high, and the toes small; the brow white, the mantle brownish grey, the head, nape, and lower portions of the body reddish yellow; the feathers upon the back have dark shafts and light borders, those on the under part of the body are marked with dark streaks; the tail is deep grey, edged with white, and darkly striped towards its tip. The quills are reddish brown, lightest in shade upon the inner web, tipped with black, and having a white border. The cere, bare cheek-stripes, and feet are bright yellow; the beak is deep orange at its base and greyish black at the tip. The length of the male is fourteen inches and a quarter; the wing measures eleven, and the tail six inches and three-quarters. The Grasshopper Buzzard makes its appearance upon the plains of Central Africa about the rainy season, during which period it finds abundance of food, and after lingering for some time, quits that part of the continent for still warmer regions. In its habits this bird is half Falcon and half Buzzard; like the latter it perches for hours together upon the branches of a tree, surveying the surrounding country, and watching for prey; then, suddenly rising, it flies, with rapid strokes of its wings, to a considerable distance, and, after hovering for a few seconds, swoops down, and pounces upon the grasshopper it has marked for its own. We are without further particulars of the life of this bird. THE TESA.