Another and daintier species, however, is almost his equal in this respect, and that is the Gray Wagtail. This bird is more susceptible to the changing seasons, and at the approach of winter deserts the higher streams altogether, or comes down to the lower and more sheltered reaches of others. The Gray Wagtail is a familiar bird along all our Yorkshire and Derbyshire streams and rivers. We look for him quite as a matter of course when we reach the rocks, and the alder and birch and mountain-ash trees, just as we expect there to find the Dipper. But this is in summer mostly; in winter he becomes far more familiar, and during that season comes much nearer to the busy haunts of men. We have often seen Gray Wagtails in the bed of the grimy Don and Sheaf in the very heart of smoky Sheffield during mid-winter; and we know the bird as a winter resident about all the streams and sluices and dams in the series of Endcliffe Woods. The bird seems, however, closely attached to the stream in its upland solitudes, and at the first sign of spring goes back to favourite haunts among the moorlands and hills. We can recall many a romantic reach of the Derwent, the Wye, and the Dove, where the Gray Wagtail, the Dipper, and the Kingfisher might be watched together, the former bird, daintiest and most charming of its kind, deftly poised on a rock in mid-stream vigorously beating its long tail, looking like a single feather until it was opened as the startled bird took flight; the two latter species flying alarmed away arrow-like, following the winding waters, the one as a particoloured ball, the other as a blue undefined streak of refulgent light. So likewise has the Gray Wagtail oft been our sole bird companion on many a Highland water, both on the mainland and in Skye. We never tire of watching its sylph-like actions, the dainty way it poises on the stones or flits along before us stage after stage in undulating flight uttering its cheery _chiz zit_ as it goes, or of admiring the exquisite blending of its showy yet delicately coloured plumage. We have often made his acquaintance upon more southern waters, far away in the remote south-west of England, but somehow he never there evokes the same feelings with which we greet him in northern haunts. The Gray Wagtail visits these upland streams for the purpose of rearing its young. Not every wanderer by the water-side is fortunate enough to get a peep at this bird's domestic arrangements. It has, fortunately perhaps, a happy way of concealing its nest under some large stone or overhanging rock, or in a quiet nook, not necessarily in a secluded spot, but often close by the wayside, where the very audacity of the selection proves a source of safety. A scrappy little nest it is, dry grass and roots and such-like litter thrown carelessly together, and lined with hair or more rarely a few feathers; artless, yet possessing a rustic beauty if wanting that elaborate finish of more painstaking nest-builders. The five or six eggs are as unassuming as the nest that holds them, grayish-white freckled with brown, and perhaps with here and there a scratch of darker hue. The bird is an early breeder, making its nest in April, although we have remarked that in Scotland it is a little later in its operations. This pretty Wagtail still further endears itself to us by its attachment to a certain breeding-place, returning in many cases year by year to build its nest in one particular spot. Unfortunately the Gray Wagtail can claim but low rank as a songster. None of our British Wagtails are singers of much merit, and all confine their melody to fitful and short snatches of rambling song, almost invariably uttered as the bird hovers and flutters in the air. The Gray Wagtail's charm rests in its pretty dress, its graceful actions, and to some extent in its loneliness, for there are few other small birds to arrest attention in the haunts it loves. It can claim our almost undivided admiration on the streams of the uplands from one extreme corner of Great Britain to the other. Certainly of few other birds can we say so much; although such an extended distribution is entirely due to physical conditions--to the presence of mountains and uplands throughout that area.