Another admirable feature in the structure of birds consists in their feathers. These are well adapted for security, warmth, and freedom of motion. The larger feathers of the body are placed over each other like the slates on the roof of a house, so that water is permitted to run off, and cold is kept out. The down, which is placed under the feathers, is a further protection against the cold; and hence it is most abundant in those species that are found in northern climates. The feathery covering of birds forms their peculiar beauty: on this, in the warm climates, Nature bestows her most delicate and brightest colors.
Another point which sets forth the resources of Infinite Wisdom is the structure and uses of the wings of birds. The size of the wings is not always in proportion to the bulk of their bodies, but is accommodated to their habits of living. Accordingly, birds of prey, swallows, and such birds as are intended to hover long in the air, have much longer wings, in proportion to their size, than hens, ducks, quails, etc. In some, such as the ostrich, the cassiowary, and the penguin, the largest quill-feathers of the wing are entirely wanting.
Then, again, how varied is the flight of birds! The falcon soars above the clouds, and remains in the air for many hours without any sign of exertion. The swallow, the lark, and other species, sail long distances with little effort. Others, like the sparrow and the humming-bird, have a fluttering flight. Some, as the owl, fly without any noise; and some, like the partridge, with a loud whir.
"Around the head Of wandering swain the white-winged plover wheels Her sounding flight, and then directly on In long excursion skims the level lawn, To tempt him from her nest."
How graceful are the motions of the hawk, sweeping higher and higher in circles, as he surveys far and wide the expanse of fields and meadows below, in which he hopes to espy his prey. Our paper would be too long were we to say even a little about the roosting, the swimming, or running, the migration, the habits and instincts, the varied notes and pleasant songs, of the endless species of birds.
All these subjects are well worthy of being carefully studied; for they all show the design of their Creator. The extraordinary creature represented in the engraving is the "Apteryx," or "wingless bird" of New Zealand. It was not known to European naturalists till of late years, and for a long time the accounts which the natives of New Zealand gave of it were discredited. A specimen of it, preserved in brine, was, however, brought to this country, and a full description of the bird given.