During 1907-1908 the economic rôle played by the Rook has been thoroughly investigated by ornithologists and farmers all over Hungary, with the results that this bird stands as a friend rather than a foe to agriculture.
Head, nape, and back, bright ash grey; a broad black band beneath the eyes; under plumage pure white; wings short, black; base of the primaries and tips of the secondaries white; tail with the two middle feathers black, and the outer on each side white with a black spot at the base, the rest black and white; bill and feet black. _Female_ of a more dingy hue above; below dull white, the proportion of black in the feathers increasing as they approach the middle; each feather of the breast terminating in a crescent-shaped ash grey spot. Length ten inches; breadth fourteen inches. Eggs bluish white, spotted at the larger end with two shades of brown. Sylvan. Young barred below.
The family of Shrikes, or Butcher-birds, would seem to occupy an intermediate station between birds of prey and insectivorous birds. The subject of the present chapter especially, though little resembling a Hawk in appearance, has, on account of its habits, some pretension to be ranked among birds of prey; from which, however, it differs in the essential particular that, as well as the rest of the family, it seizes and carries off its prey with its beak and not with its claws. Although a fairly common visitor from autumn to spring this Shrike does not breed with us, and is rarer in Ireland. It derives its name _excubitor_ (sentinel) from its favourite habit of posting itself on the topmost twig of a poplar or other lofty tree, whence it keeps up a watchful look-out, not only for its prey, but for any bird of the Hawk tribe, against which it wages incessant and deadly hostility. When it descries one of these birds, which it does at a great distance, it utters a shriek, as if for the purpose of giving an alarm, a cry which is instantly repeated by all birds of the same species which happen to be within hearing. This antipathy against birds of prey is taken advantage of by fowlers in France, who, when setting their nets for hawks, take with them a 'sentinel' Shrike and station it near the living bird, which they employ as a lure. So rapid is the swoop of the Falcon that but for the warning cry of the Shrike it would descend and carry off its victim before the fowler had time to close his nets; but the keen eye of the sentinel detects, and his shrill cry announces, the approach of his enemy, and the fowler has time to prepare. The principal food of this bird appears to be mice, frogs, lizards and insects, especially the stag-beetle and grasshopper, though in its natural state it will capture and destroy any birds inferior to itself in strength and courage. Its name _Lanius_ (Latin for butcher) and Butcher-bird were given to it from its habit of impaling beetles and small birds on thorns in the vicinity of its nest. Its flight is peculiar, being composed of a series of dips, like that of the Wagtail; and when it quits its perch on the summit of one tall tree to fly to another, it drops and rises again so as to form a curve like that of a loose rope hung from two tall masts. Another peculiarity of the Shrike is a remarkable power of imitating the song of other birds, which it is said to exercise in order to obtain its food more easily, by beguiling the nestlings of the smaller birds into answering it by a chirrup, and so betraying their retreat. The notes which it has been observed to imitate are those of the Nightingale, Robin, Swallow, and Stonechat. Its proper note is harsh, resembling somewhat that of the Kestrel, _Shake-shake_! the call note is _truii_! Of the Lesser Grey Shrike, _Lanius minor_, there have been few occurrences in these Islands.