The Condor

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Cooper Ornithological Club, 1904 - Birds
 

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Page 158 - ... one lifts its closed wing and nibbles at the feathers beneath, or rarely, if in a hurry, quickly turns its head. The partner, during this short performance, assumes a statuesque pose, and either looks mechanically from side to side or snaps its bill loudly a few times. Then the first bird bows once and, pointing its head and beak straight upward, rises on its toes, puffs out its breast, and utters a prolonged, nasal ah-hhh, with a rapidly rising inflection and with a distinctly 'anserine' and...
Page 125 - With troops of fledglings catching their winged prey as they go and lodging by night in tall chimneys, the flocks drift slowly south joining with other bands, until on the northern coast of the Gulf of Mexico they become an innumerable host. Then they disappear. Did they drop into the water or hibernate in the mud, as was believed of old, their obliteration could not be more complete.
Page 116 - ... beginnings of migration ages ago were intimately connected with periodic changes in the food supply, but this motive is at present so intermingled with others unknown, or but imperfectly known, that the migration movements seem now to bear little relation to the abundance or absence of food. . . . Data recently collected at the Florida light-houses by the Biological Survey show that southward migration begins at least by the loth, and probably by the ist of July, insect-eating birds departing...
Page 121 - Mexico (see fig. 2, route 5), though this 400 miles of water journey hardly shortens the distance of travel by an hour's flight. Thus birds avoid the hot, treeless plains and scant provender of southern Texas by a direct flight from the moist, insect-teeming forests of northern Texas to a similar country in southern Mexico.
Page 116 - ... Biological Survey, contains the following statement: "For more than two thousand years the phenomena of bird migration have been noted, but while the extent and course of the routes traveled have of late become better known, no conclusive answer has been found to the question, why do birds migrate? . . . The broad statement can be made that the beginnings of migration ages ago were intimately connected with periodic changes in the food supply, but this motive is at present so intermingled with...
Page 119 - ... it has been noted in ornithological literature as one of the principal migration highways of North American birds. As a fact, it is almost deserted except for a few Swallows, some shore birds, and an occasional land bird storm driven from its accustomed course, while over the Gulf route night after night for nearly eight months in the year myriads of hardy migrants wing their way through the darkness toward an unseen destination.
Page 116 - How do birds find their way over the hundreds or thousands of miles between the winter and summer homes? Among day migrants sight is probably the principal guide, and it is noticeable that these seldom make the long single flights so common with night migrants. Sight undoubtedly plays a part in guiding the night journeys also; on clear nights, especially when the moon shines brightly, migrating birds fly high, and the ear can scarcely distinguish their faint twitterings; if clouds overspread the...
Page 54 - Monthly; 48 pages, 8xio inches; per year, $1.50. A magazine devoted to nature and illustrated by color photography. It is the only periodical in the world which publishes pictures of birds, animals, insects, flowers, plants, etc., in natural colors. Eight full-page plates each month.
Page 117 - ... Buffeted by the wind and their sense of direction lost, these birds fall easy victims to the lure of the lighthouse. Many are killed by the impact, but many more settle on the framework or foundation until the storm ceases or the coming of daylight allows them to recover their bearings. A favorite theory of many American ornithologists is that coast lines, mountain chains, and especially the courses of the larger rivers and their tributaries form well-marked highways along which birds return...

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