By Olin Sewall Pettingill Jr.
This new version of Ornithology in Laboratory and Field maintains to supply updated insurance of the real points of recent ornithology. starting with an outline of ornithology this present day, Pettingill explores such subject matters as exterior and inner anatomy, body structure, ecology, flight, habit, migration, existence histories, and populations
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This re-creation of Ornithology in Laboratory and box maintains to supply up to date assurance of the real elements of recent ornithology. starting with an summary of ornithology at the present time, Pettingill explores such themes as exterior and inner anatomy, body structure, ecology, flight, habit, migration, lifestyles histories, and populations
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Extra resources for Ornithology in Laboratory and Field
The bases of the barbs then fuse with the ridge of the rachis, "the rachidial ridge," at an oblique angle. ) Finally the sheath splits and disintegrates, allowing the feather (which has been rolled up in the sheath with its dorsal surface against the sheath and its ventral surface next to the pulp) to flatten out. The stratum intermedium soon stops proliferating barb ridges, leaving the base of the feather as the calamus; the pulp is resorbed and caps are formed from the innermost epidermal layers surrounding the pulp.
1932 Handbook of Birds of Eastern North America. Second revised edition. D. Appleton and Company, New York. (Dover reprint available. Habits and structure; uses of bill, wings, and feet, pp. ) Coues, E. 1903 Key to North American Birds. Fifth edition. Two volumes. Dana Estes and Company, Boston. (Volume 1, pp. ) Fisher, H. I. 1940 The Occurrence of Vestigial Claws on the Wings of Birds. Amer. , 23:234-243. Hess, G. 1951 The Bird: Its Life and Structure. Greenberg, New York. ) Jack. A. 1953 Feathered Wings: A Study of the Flight of Birds.
If possible, study and compare the pterylosis of several widely different species of birds, adult as well as natal forms. Use the papers by Humphrey and Clark (1961) and Wetherbee (1957) as models for detailed study. Among different species, and between groups of species, a considerable variation exists with respect to the size and shape of pterylae, presence of certain apteria, the density of feathers on certain pterylae, and the number of remiges and rectrices and their coverts. Within a species, however, or a group of species, the pterylae and apteria show generally constant characteristics.
Ornithology in Laboratory and Field by Olin Sewall Pettingill Jr.