A small bird that spends hours together on the wing, dashing through the air at great speed, frequently changing its course, now flying high, now just skimming the ground, must be either a swallow or a swift. Many people are totally at a loss to distinguish between a swallow and a swift. The two birds differ anatomically. A swift is not a passerine bird. It cannot perch. When it wants to take a rest it has to repair to its nest. Swallows, on the other hand, are fond of settling on telegraph wires. It is quite easy to distinguish between the birds when they are on the wing. A flying swift may be compared to an anchor with enormous flukes (the wings), or to an arrow (the body) attached to a bow (the wings). As the swift dashes through the air at a speed of fully 100 miles an hour, it never closes its wings to the sides of its body; it merely whips the air rapidly with the tips of them. On the other hand, the swallow, when it flies, closes its wings to its body at every stroke. Notwithstanding its greater effort, it does not move nearly so rapidly as the swift. The swifts will be considered in their proper place. Three species of swallow are likely to be seen in the Himalayas. A small ashy brown swallow with a short tail is the crag-martin (Ptyonoprogne rupestris).
The common swallow of England (Hirundo rustica) occurs in large numbers at all hill stations in the Himalayas. This bird should require no description. Its glossy purple-blue plumage, the patches of chestnut red on the forehead and throat, and the elegantly-forked tail must be familiar to every Englishman. As in England, this bird constructs under the eaves of roofs its nest of mud lined with feathers.
Not unlike the common swallow, but readily distinguishable from it in that the lower back is chestnut red, is Hirundo nepalensis—Hodgson's striated swallow, or the red-rumped swallow, as Jerdon well called it. This bird also breeds under eaves. Numbers of red-rumped swallows are to be seen daily seeking their insect quarry over the lake at Naini Tal.
THE MOTACILLIDÆ OR WAGTAIL FAMILY
The great majority of the wagtails are merely winter visitors to India. Thus they are likely to be seen in the hills only when resting from their travels. That is to say, in April and May, when homeward bound, or in September and October, when they move southwards. A few wagtails, however, tarry in the hills till quite late in the season. The wagtail most likely to be seen is the grey wagtail (Motacilla melanope). This species, notwithstanding its name, has bright yellow lower plumage. It nests in Kashmir.
Allied to the wagtails are the pipits. These display the elegant form of the wagtail and the sober colouring of the lark.
They affect open country and feed on the ground. The upland pipit (Oreocorys sylvanus) is the common species of the Himalayas. It constructs a nest of grass on the ground, into which the common cuckoo, of which more anon, frequently drops an egg.
THE NECTARINIDÆ OR SUNBIRD FAMILY
The sunbirds are feathered exquisites. They take in the Old World the place in the New World occupied by the humming-birds. Sunbirds, however, are superior to humming-birds in that they possess the gift of song. They are not particularly abundant in the Himalayas, and, as they do not seem to occur west of Garhwal, I am perhaps not justified in giving them a place in this essay.