In some of those birds which have a peculiarly harsh or trumpeting voice, the trachea is lengthened, forming loops which lie subcutaneously (capercally, curassow), or it enters and dilates the symphysis of the furcula (crested guineafowl); or, e.g.
There is the interesting white-necked guineafowl, Agelastes (which is found on the Gold Coast and elsewhere west of the lower Niger); there is one peculiar species of eagle owl (Bubo lettii) and a very handsome sparrow-hawk (Accipiter bitttikoferi); a few sun-birds, warblers and shrikes are peculiar to the region.
The birds include eagles - some are called lammervangers from their occasional attacks on young lambs - vultures, hawks, kites, owls, crows, ravens, the secretary bird, cranes, a small white heron, quails, partridges, korhaans, wild geese, duck, and guineafowl, swallows, finches, starlings, the mossie or Cape sparrow, and the widow bird, noted for the length of its tail in summer.
Other game birds include the francolin, quail, guineafowl, sand-grouse, snipe, wild duck, wild goose, widgeon, teal, plover and rail.
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