a considerable time after they are fully fledged, sometimes not leaving it until the winter, for the Shrike, if undisturbed, breeds but once in the course of the year. THE SENTINEL BUTCHER BIRD. The SENTINEL BUTCHER BIRD, or GREAT GREY SHRIKE (_Lanius Excubitor_), is from nine and a half to ten inches long, and its breadth about fourteen inches; the wing measures four inches and the tail four and a half. Upon the upper part of the body the plumage is of an uniform light grey; the under side is pure white, and a broad black stripe passes across the eyes. The upper half of the large primary quills, as well as the inner webs and tips of the secondaries, are white, their other portions and the rest of the quills being black; the centre tail-feathers are black, but with the exception of a large black spot upon the centre of the inner web of the fifth, and a black streak upon the shaft of the exterior feather, the rest are entirely white. The eye is brown, the beak black, and the foot dark grey; the plumage of the female is less pure in its coloration than that of her mate: the young are recognisable by the wave-like markings upon the breast and other parts of the body. The egg is shown at Fig. 3, Coloured Plate XVI. This species of Shrike is found in almost every European country, and throughout a large part of Asia and Northern Africa; it is also very numerous in North America. Everywhere it appears to prefer woodland districts, but is nevertheless constantly met with both in mountain ranges and in marshy plains. Whilst on the alert for prey it may usually be seen upon the topmost branches of a tree, peering eagerly about in all directions, in the hope of detecting any small bird or mouse that may be near, pouncing down and killing it with wonderful dexterity as soon as the proper moment arrives. If the destroyer is hungry the prey is at once dragged away and devoured; but should this not be the case, the body is impaled upon a thorn, and left for a future meal. Even when tame it continues this habit, and has been known to make constant use of a spike driven into a wall for that purpose by its owner.