. L'oiseau, sa forme et sa fonction . Vautour,et les divers oiseaux autruches-comme, il ya parfait clawsat les bouts d'un ou plusieurs de la peau-liés ailes-doigts.ce sont de vraies reliques d'une ascendance de la main de lézard. Avant de continuer à trouver les utilisations plus curieuses à laquelle les ailes de Win gs 323 sont mises, nous allons regarder certains oiseaux dont la flighteCAN nous enseigner quelque chose de nitreining. Si une incaptivité de faisan s'inquiète soudainement, ou si sa spacieuse aviarytente de s'élever du sol, nous entendons un grand Whirr, - de larges ailes arrondies bourdonnement dans un demi-cercle de brusharound de l'oiseau et il est éteint comme un coup de feu

• Contributeur: Reading Room 2020 / Alamy Banque D'Images
• ID de l’image: 2CNFWJR
• Taille du fichier: 7,1 MB (431,1 KB Téléchargement compressé)
• Autorisations: Modèle - non | Propriété - non
• Dimensions: 1633 x 1530 px | 27,7 x 25,9 cm | 10,9 x 10,2 inches | 150dpi

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Cette image peut avoir des imperfections car il s’agit d’une image historique ou de reportage.

. The bird, its form and function . Vulture, and the various ostrich-like birds, there are perfect clawsat the tips of one or more of the skin-bound wing-fingers.These are true relics of a lizard-handed ancestry. Before going on to find the more curious uses to which Win gs 323 wings are put, we will look at certain birds whose flightcan teach us something niteresting. If a pheasant incaptivity becomes suddenly alarmed, or its spacious aviarytempts it to rise from the ground, we hear a great whirr, —broad, round-curved wings buzz in a half-circle of hazearound the bird and it is off like a shot to the farther. Fig. 25S.—Young Cireen Heron, reaching out with its wing toward a branch whichit hooked with the sprouting feathers, and steadied itself for a new foothold. end of the runway. It may go right through the sashand pane of glass—such is the impetus gained in this madrush. Fortunate it is for these birds, and for their cousins, tne grouse and quail, that they can thus spring up andescape from foxes and other enemies to whom their scentso often betrays them. If the pheasant were at liberty, 324 The Bird we should see that this burst of speed would end ina long, slowly descending sail, and with wings held mo-tionless the bird would sink into the nearest cover. It ismost interesting and exciting to walk through a fieldof tall grass where many pheasants are feeding, and seethem shoot up to the right and to the left; a hen withher brood waiting until ones foot is almost upon herbefore booming away. In a zoological park we may observe another extremeof bird flight by watching a condor take w

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