. Animal activities; a first book in zoo?logy. Zoology; Animal behavior. BIRDS. 205 materially to the weight. The whole plumage of a common fowl weighs only about three ounces. Having plumage filled with air heated by the body, carrying air-sacs in viscera and bones, breathing faster than other animals, pumping blood more rapidly to all parts of its body, and with it, oxygen to replenish the internal fires, the bird easily rises on the atmos- phere much as an iron ship floats on the ocean. Other Voluntary Movements. Swimming birds have the toes webbed to serve as paddles and the form of the bo
. Animal activities; a first book in zoo?logy. Zoology; Animal behavior. BIRDS. 205 materially to the weight. The whole plumage of a common fowl weighs only about three ounces. Having plumage filled with air heated by the body, carrying air-sacs in viscera and bones, breathing faster than other animals, pumping blood more rapidly to all parts of its body, and with it, oxygen to replenish the internal fires, the bird easily rises on the atmos- phere much as an iron ship floats on the ocean. Other Voluntary Movements. Swimming birds have the toes webbed to serve as paddles and the form of the body is modified to fit it for motion through the water. The legs are placed farther back so that the propel- ling power may act from behind. In running and wading the struc- ture of legs, feet, wings and beak are wonderfully fitted for their peculiar work. Not only can birds move from place to place in search of food, or in undertaking their long migrations, but by voluntary movements they are also able to perform skilled labor in the building of nests, to carry on warfare, and to express the most varied emotions. Birds and Reptiles. Birds resemble reptiles in many ways. They have epidermal scales on some part of the body, the digits end in claws, the lower jaw is connected to the upper jaw by a quadrate bone, the skull is fastened to the first vertebra by a single con- dyle, true ribs are present, there are no gills, the eggs are large, and the digestive, reproductive, and excre- tory organs empty into a single cavity, the Fig. 162.—The Sternum of a 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 French, Nathaniel Stowers, 1854-. New York [etc. etc. ] Longmans, Green and Co
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