Elementary textbook of economic zoology and entomology . elementarytextbo00kell Year: [c1915] 274 ECONOMIC ZOOLOGY AND ENTOMOLOGY into wings, and the toothless, beaked mouth are characteristic and distinguishing external features. The feathers, although covering the whole of the surface of the body, are not uni- formly distributed, but are grouped in tracts called pterylce, separated by bare or downy spaces called apteria. They are of several kinds, the short soft plumules, or down feathers, the large, stiffer, contour feathers, whose ends form the outermost FIG. 126.—A body feather and a
Elementary textbook of economic zoology and entomology . elementarytextbo00kell Year: [c1915] 274 ECONOMIC ZOOLOGY AND ENTOMOLOGY into wings, and the toothless, beaked mouth are characteristic and distinguishing external features. The feathers, although covering the whole of the surface of the body, are not uni- formly distributed, but are grouped in tracts called pterylce, separated by bare or downy spaces called apteria. They are of several kinds, the short soft plumules, or down feathers, the large, stiffer, contour feathers, whose ends form the outermost FIG. 126.—A body feather and a wing feather from a chicken. (Reduced.) covering of the body, the quill feathers of the wings and tail, and the fine bristles, or vibrissa?, about the eyes and nostrils, called thread feathers. The fore limbs are modified to serve as wings, which are well developed in almost all birds. How- ever, the strange kiwi, or Apteryx, of New Zealand with hair- like feathers is almost wingless, and the penguins have the wings so reduced as to be incapable of flight, but serving as flippers to aid in swimming underneath the water. The
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