The hobby in appearance is a lesser peregrine, being about one-fifth smaller than that bird. It differs from the peregrine in having a softer plumage and a comparatively greater length of wing. It is probably the fastest flier among rapacious birds, being capable of the marvellous feat of capturing swallows and martins in the air. It is a summer visitant to this country, and is most often met with in the southern counties of England, where, however, it is a rare species; and the farther north we go the rarer it becomes. In Scotland it is not known to breed, and it does not range to Ireland. It inhabits woods, and breeds in an old nest of the carrion crow, jay, or some other bird, which it does not re-line. Three eggs are usually laid, and in some rare instances four or five. In size and colour they are not distinguishable from those of the kestrel. The hobby is a spirited bird, but in courage and power greatly inferior to the peregrine. He preys principally on dragon-flies, beetles, and other large insects, and on small birds, such as skylarks and buntings. In falconry, the hobby was trained to fly at such small game as larks, snipe, and quail. Merlin. Falco æsalon. [Illustration: FIG. 71.--MERLIN. ⅛ natural size.] Upper parts greyish blue; under parts reddish yellow with longitudinal dark brown spots; tail barred with black; beak bluish, darker at the tip; cere yellow; iris dark brown; feet yellow; claws black. _Female_: upper parts tinged with brown; lower parts yellowish white. Length, eleven to twelve inches. * * * * * The merlin is a third less than the peregrine in size, and has the distinction of being the smallest of the British birds of prey, But in courage it is second to none, and Yarrell relates an instance in which this small bird, weighing itself no more than six ounces, struck down and killed a partridge twice as heavy. It is a resident throughout the year of the British Islands, from the north of Yorkshire to the Shetlands, and the mountainous parts of Ireland. The merlin is an inhabitant of the moors and mountains, and nests on the ground among the tall heather. The eggs are laid in a slight hollow with little or no lining, and are four or five in number, smaller than those of the kestrel, but similar in colour. It sometimes, but very rarely, breeds in the nest of a carrion crow or other bird, in a tree. It preys chiefly on small birds, and it was formerly trained to pursue snipe, pigeons, larks, blackbirds, &c. Kestrel, or Windhover. Tinnunculus alaudarius.