. Elements of biology; a practical text-book correlating botany, zoology, and human physiology. Biology. Ptarmigan in summer. Davison, Zoology. are best known to us are the hawks, the condor, with its great sweep of ten feet from wing to wing, and the eagle. To the hawks belong two birds which are, because of their habits, harmful to man. They are the sharp-shinned hawk and Coop- er's hawk. IV. Waders.—These are birds with unusually long legs and long necks, the latter character being a natural correlation of greatest ser- vice in food getting. Examples are the mud hen or coot, the snipe, cran
. Elements of biology; a practical text-book correlating botany, zoology, and human physiology. Biology. Ptarmigan in summer. Davison, Zoology. are best known to us are the hawks, the condor, with its great sweep of ten feet from wing to wing, and the eagle. To the hawks belong two birds which are, because of their habits, harmful to man. They are the sharp-shinned hawk and Coop- er's hawk. IV. Waders.—These are birds with unusually long legs and long necks, the latter character being a natural correlation of greatest ser- vice in food getting. Examples are the mud hen or coot, the snipe, crane, heron, and stork. The last two are the giants of the group. The Swimmers and Divers.—• Birds placed in these orders have snow which surrounds it; in the spring it molts, turning to a gray and white, thus re- sembling the lichens among which it feeds. III. Birds of Prey.— These birds are character- ized by the strong hooked beak, adapted to tearing, and by the sharp claws, which are curved and strong. The need of a gizzard, which is a promi- nent part of the digestive tract in a grain-eating bird, has here almost completely disappeared, the crop serving to macerate the food. Owls show this use of the muscu- lar gullet and crop, for the hair and skeletons of the mice which form their prey are ejected in a small ball, by means of this muscular organ. Members of this group that. Golden eagle (Aquila chrysactos). North Amer- ica and Europe. Copyright, 1901, by , Zoological Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Hunter, George William, 1873-1948. New York, American book company
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