1859.] The Winter-Birds 329
no distinct perception of the bird during its flight It is quite otherwise with the Quail. The body of this bird is plump and heavy, and his wings are short, and have a peculiar concavity of the under surface when expanded; their motions are very rapid, and, having but little sweep, the bird seems to sail on the air, carried along by a gentle but rapid vibration of the wings, which describe only a very small arc of a circle. Hence we observe the entire shape of the bird during its flight. The Partridge, and other gallinaceous birds, fly in a similar manner; but, on account of their larger size, their motions are less attractive.
The Humming-Bird has proportionally larger wings than the Quail, and, when flying, his wings describe almost a complete circle in their rapid vibrations. If we look upon one during his flight, he seems to have no wings, but rather to be encircled by a semi-transparent halo. There are other birds that seem to be wings only, their bodies being hardly perceptible, on account of their small proportional size ; such are the Swallow, the Pigeon, the Cuckoo, and the Night-Hawk.
Birds of prey are remarkable for their steady and graceful flight ; the motion of their wings is slow, while, like the Pigeon, they are capable of propelling themselves through the air with great rapidity. The circumgyrations of a Hawk, when reconnoitring far aloft in the air, are singularly graceful. The flight of the Crow and the Raven is slow and apparently difficult, and they are easily overtaken and annoyed by the King-Bird and other small birds. They are not formed, like the Falcon, to catch their prey upon the wing, and, though their wings are large and powerful, they are incapable of performing those graceful and difficult evolutions which we observe in the flight of birds of prey. The flight of Herons resembles that of the Raven.
Small birds, with the exception of a few species, move in an undulating course, alternately rising and sinking. Birds that move in this manner are, I believe, incapable of making a long journey on the wing without rest, and commonly perform their migrations by short daily stages.
The flight of the little Sand-Pipers, which frequent the salt marshes in numerous flocks, is particularly worthy of study. It is not unlike the flight of Quails, but more evenly sustained, on account of the greater length and power of their wings. These birds are capable of holding an even flight in a perfectly horizontal line, only a few inches above the surface of the ground. When they alight, they seldom make a curve or gyration, but descend in a straight and oblique course. Snow-Buntings usually turn about, just before they reach the ground; and I have seen them perform the most intricate changes, like the movements of a cotillon-party, executed with the rapidity of arrows, when suddenly checked in their flight by the discovery of a good tract of forage.
With these observations, which might be indefinitely extended, I take leave of the subject, simply remarking, that to the motions of birds, no less than to their beauty of plumage and the sounds of their voices, are we indebted for a great part of the picturesque attractions of landscape; and the more we study them, the more are we convinced, that, in whatever direction we turn our observations, we may extend them to infinity. There is no limit to any study of Nature, and even one so apparently insignificant as the flight of birds leads to an endless series of interesting facts, and opens the eyes to new beauties in the aspect of Nature and new sources of rational delight
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