Female--Length, 13 to 13-1/2 inches; wing, 11-1/4; tail, 6-1/4. Male--Length, 11 to 12 inches; wing, about 10-1/2; tail, 5-1/2. This very beautiful and graceful little hawk may at once be identified by the exceeding length of its wings, which, when closed, extend a full half-inch beyond the end of the tail. It is conspicuous also by its very marked colouring, which is in young birds almost black on the upper parts, each feather, however, being tipped with fulvous brown. The lower plumage is creamy white, streaked profusely with dark brown splashes, and tinted on the throat and sides of the head with a warm buff. There is a broad black patch below the eye, and a black eyebrow, with a small streak of buff above it. The moustache is broad and strongly marked. The cere is greenish grey; and the feet, originally of the same hue, develop gradually into light yellow, and later into gamboge and bright orange. The deck feathers are plain, but all the others are barred both above and below by about ten cross-bands of lighter brown. In adults the upper plumage changes to a uniform dark slate colour, nearly black towards the head. The flanks and thighs, especially in the male, assume a more and more distinct rufous colour. The feet are proportionately small, and the legs decidedly weak. There are strong evidences that the hobby, when commonly bred in Western Europe, was used with success for taking larks, not only by the process of "daring" referred to later on in the chapter on lark-hawking, but in actual flight, and that the female was used for taking partridges in the same way. The failure of modern falconers to make any practical use of this elegant and prepossessing hawk, is noticed in detail in the same chapter. Owing to its natural tameness, the hobby is especially liable to fall a victim to persecution by gamekeepers and naturalists, and has as a result been nearly exterminated in England. A wild hobby has been seen by credible witnesses to take a swift on the wing in Bulgaria. A trained female has been known in England to take house-pigeons. Merlin (_Falco æsalon_) Female--Length, 11-1/2 to 12 inches; wing, 8-1/2 to 9; tail, 5-1/4 to 5-3/4; weight, about 8 oz. Male--Length, 10-1/2 to 11 inches; wing, 8 to 8-1/4; tail, 4-3/4 to 5; weight, 6-1/4 to 6-3/4 oz.