English:
Identifier: birdlifeguid00chap (find matches)
Title: Bird-life; a guide to the study of our common birds
Year: 1898 (1890s)
Authors: Chapman, Frank M. (Frank Michler), 1864-1945 Seton, Ernest Thompson, 1860-1946
Subjects: Birds
Publisher: New York, D. Appleton and company
Contributing Library: The Library of Congress
Digitizing Sponsor: The Library of Congress
View Book Page: Book Viewer
About This Book: Catalog Entry
View All Images: All Images From Book
Click here to view book online to see this illustration in context in a browseable online version of this book.
Text Appearing Before Image:
also of assistance to them on their migrations. Indeed, atnight, young birds, who have never made the journey be-fore, must rely largely upon this sense to direct them. Itis difficult for us to realize that on favorable nights duringthe migratory season myriads of birds are passing throughthe dark and apparently deserted air above us. Oftenthey are so numerous as to form a continuous stream, andif we listen we may hear their voices as they call to oneanother while flying rapidly onward. Some idea may be formed of the multitude of birdswhich throng the upper air on favorable nights duringtheir migration by using a telescope. One having a two-inch object glass will answer the purpose. It should befocused on the moon, when the birds in passing are sil-houetted against the glowing background. At the properfocal distance they appear with startling distinctness. Insome cases each wing-beat can be detected, and with alarge glass it is even possible to occasionally, recognizethe kind of bird.
Text Appearing After Image:
Plate XVII. Page 107. SHARP-SHINNED HAWK. Length of male, 11-25 inches; of female, 13-50 inches. Adult, upper partsslaty gray ; under parts white and rusty brown. Young, upper parts black-ish brown ; under parts white, streaked with rusty brown. MANNER OF MIGRATION. 57 Observations of this kind should be made in Septem-ber, when the fall migration is at its height. On thenight of September 3, 1887, at Tenafly, New Jersey, afriend and myself, using a six-and-a-half-inch equatorialglass, saw no less than two hundred and sixty-two birdscross the narrow angle subtended by the limbs of themoon between the hours of eight and eleven. Observa-tions made several years later, in September, from theobservatory of Columbia University, yielded closely simi-lar results. This nocturnal journey of birds may also be studiedfrom lighthouses. On September 26, 1891, I visited theBartholdi Statue of the Goddess of Liberty, in New YorkBay, for this purpose. The weather was most favorable.The first bird was
Note About Images
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 work.