. Animal activities : a first book in zoölogy. Zoology; Animal behavior. 2o6 ANIMAL ACTIVITIES. Some fossil birds had teeth Hke reptiles, and at least one bird had a long reptilian tail (Fig. i66). Because of these resemblances birds and reptiles have sometimes been classed together as Saiiropsida. Classification of Birds. Birds have been most com- monly classed in accordance with their most easily. Fig. 163.—Feathers, a, a quill-feather ; b, quill-feathers fastened to wing ; c, a shape-feather ; d, a down-feather. recognized points of external structure; this structure being dependent largely
. Animal activities : a first book in zoölogy. Zoology; Animal behavior. 2o6 ANIMAL ACTIVITIES. Some fossil birds had teeth Hke reptiles, and at least one bird had a long reptilian tail (Fig. i66). Because of these resemblances birds and reptiles have sometimes been classed together as Saiiropsida. Classification of Birds. Birds have been most com- monly classed in accordance with their most easily. Fig. 163.—Feathers, a, a quill-feather ; b, quill-feathers fastened to wing ; c, a shape-feather ; d, a down-feather. recognized points of external structure; this structure being dependent largely on the habits of the birds. These groups of birds are often spoken of as orders; but these orders do not correspond to orders among 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 S. (Nathaniel Stowers), 1854-. New York ; London : Longmans, Green, and Co.
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