. Principles of economic zoo?logy. Zoology, Economic. 278 BRANCH CHORDATA Classification.—The classification of birds seems to be chaotic, no two zoologists agreeing. Some claim birds are of too recent origin geologically to have differentiated as yet into well- marked orders. They might be grouped as land birds and water birds, or as runners and flyers, but such classification would not be scientific. If there were a geologic series showing the nat- ural affinities, a natural classification would be a comparatively easy task, as all classification should be based on development and structure.
. Principles of economic zoo?logy. Zoology, Economic. 278 BRANCH CHORDATA Classification.—The classification of birds seems to be chaotic, no two zoologists agreeing. Some claim birds are of too recent origin geologically to have differentiated as yet into well- marked orders. They might be grouped as land birds and water birds, or as runners and flyers, but such classification would not be scientific. If there were a geologic series showing the nat- ural affinities, a natural classification would be a comparatively easy task, as all classification should be based on development and structure. Division A. Rati't^ Living birds are divided into two groups, the Rati'tas and the Carina'tce. Ratitse are birds with a raft-like or keelless breast bone, wings rudimentary or too small for flight, legs large, strong, and fitted for rapid running. As examples may be. Fig. 226.—Ap'teryx aiislral'is, a nocturnal flight li'.ss bird with nostrils near the end of the bill. The external wing is shown in the upper part of the out. (Romanes.) named the ostrich, emu, rhea, cassowary, kiwi (Fig. 22G), and the extinct moa and other ostrich-like birds. None of these birds is native to the United States, but in recent >ears they have been imported into some parts of the west, as Pasadena, California, Salt River Valley, Arizona, and some other dry, warm. 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 Daugherty, Lewis Sylvester, 1857-; Daugherty, L. S. , Mrs. , 1859-. Philadelphia, London, W. B. Saunders
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Keywords: ., bookcentury1900, bookdecade1910, bookpublisherphila, bookyear1915
