The Tok is commonly met with in all the forests of Abyssinia, Eastern Soudan, and Cordofania, and occurs, we believe, throughout the whole of the wooded portions of Central, Western, and Southern Africa. Occasionally we have noticed it living among the wooded portions of the steppes, and have seen it in large numbers upon the lofty trees that abound in the river valleys. According to Heuglin, it is found upon the mountains at an altitude of seven thousand feet above the sea. Like other Hornbills, it is a true tree-bird, and but rarely descends to the ground, except when the supply of fruit and berries upon which it principally subsists falls short. Certain trees are usually selected as favourite resting-places, and upon them it perches with the utmost regularity, taking possession of the highest branches, upon which it sways itself to and fro, varying the entertainment from time to time by hopping clumsily from bough to bough. Its flight somewhat resembles that of the Woodpecker, and is produced by a series of rapid strokes, by means of which the bird rises quickly into the air to a certain height, from whence it precipitately descends, with the head downwards, in a series of curves. This process is repeated many successive times, the tail meanwhile being alternately spread and closed. The cry of the Tok, which is supposed to be represented by its name, is usually reiterated with great persistence and such rapidity as frequently to have almost the effect of one sound prolonged for a minute at a time, each note being accompanied by a duck of the head that gives a most absurd effect to the whole performance, as, owing to the quickness of utterance in which the bird indulges as it becomes excited, it is compelled to exert itself to the utmost, in order that the bow and the cry may be simultaneous. In disposition this species exhibits all the curiosity and keenness of observation possessed by the Raven, and, like that noisy bird, never fails to betray the presence of any unusual object to all its feathered companions by the loudness of its warning cries, which appear to be uttered solely for their benefit, for the Tok itself boldly darts down upon even the larger birds of prey, and grievously torments the leopard of its native forests by harrying it during its search for food. The stomachs of such of these birds as we examined contained only fruits, seeds, and insects, but it is probable that they also plunder nests and devour small quadrupeds. Heuglin mentions having seen a nearly-allied species on a piece of carrion, but whether it was employed in consuming it or merely in gleaning the flies from its surface he was unable to ascertain. The Arabs state that the Tok deposits its eggs in holes in trees, at the commencement of the rainy season. * * * * *