. [Articles sur les oiseaux à partir de National Geographic magazine]. Les oiseaux. 712 LA REVUE NATIONAL GEOGRAPHIC. Un pic à bec d'Ivoire quitte la maison : ET SA PARTENAIRE PREND SON TOUR SUR LES OEUFS DES OISEAUX Le travail dans deux heures pendant la journée, mais la femelle ne quitte son partenaire en service toute la nuit - pour que elle sait toujours où il est, dit l'auteur ! Le nid est de 43 pieds dans une impasse swamp maple et mesuré 4J4 pouces de diamètre. La grande quantité de blanc dans les ailes de l'oiseau distingue ce roturier dupliquée pic. pipe. Cette résonance est accordée au son par le cou sacs qui le

• Contributeur: Central Historic Books / Alamy Banque D'Images
• ID de l’image: PFYG6A
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. [Articles about birds from National geographic magazine]. Birds. 712 THE NATIONAL GEOGRAPHIC MAGAZINE. AN IVORY-BILLED WOODPECKER LEAVES HOME: AND HIS MATE TAKES HER TURN ON THE EGGS The birds work in two-hour shifts during the day, but the female leaves her partner on duty all night—so that she always knows where he is, says the author! The nest hole was 43 feet up in a dead swamp maple and measured 4J4 inches in diameter. The great amount of white in the wings distinguishes this bird from the commoner plicated woodpecker. pipe. Such resonance is given to the sound by the neck sacs that the birds can be heard for two miles on a quiet morning. The strong winds made sound recording very difficult in western Oklahoma, though such clarion calls as those of the western meadowlark and the "whip-whirr" of the burrowing owls at dusk came through very distinctly. We failed to record, however, the white-necked ravens and Mississippi kites which, while rare in iriany parts of their range, are fairly common on the Davison Ranch. From Okla- homa our expedi- tion moved north and west through the barren, wind- swept prairies of western Kansas into the ver- dant irrigated stretches of east- ern Colorado, and thence to Colorado Springs and Denver. Here we were met and gener- ously assisted by Mr. Robert Nied- rach. Curator of Birds at the Colo- rado Museum of Natural History. Director J. D. Figgins kindly re- lieved him of other duties so he could help us in our efforts to re- cord and film the golden eagles and prairie falcons which are still not uncommon in the vicinity of Denver. Never shall I forget the experi- ence of lying prone for four hours on a flat rock at the edge of Box Elder Canyon, a few miles north of Fort Collins, watching and waiting for a golden eagle to return to its eyrie. Directly below me the cliff fell away 750 feet, while the nesting ledge was only tiO feet down. I was covered with one of our grass blinds so that the eagle would not see me and

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