. L'uccello, la sua forma e funzione . Vulture, e i vari uccelli struzzo-simili, ci sono clawsat perfetto le punte di uno o più della pelle-legata ala-fingers.These sono vere reliquie di un ascendenza lucertola-mano. Prima di andare avanti a trovare gli usi più curiosi a cui Win gs 323 ali sono messi, esamineremo alcuni uccelli il cui flightCAN ci insegna qualcosa di nitresting. Se un'incattività fagiano diventa improvvisamente allarmata, o la sua spaziosa aviarytempts a sollevarsi da terra, sentiamo un grande vortice, - ampie ali arrotondate-curve buzz in un mezzo cerchio di nocciolo l'uccello ed è fuori come un colpo

• Collaboratore: Reading Room 2020 / Alamy Foto Stock
• ID dell’immagine: 2CNFWJR
• Dimensioni dei file: 7,1 MB (431,1 KB Download compresso)
• Liberatorie: Modello - no | Proprietà - no
• Dimensioni: 1633 x 1530 px | 27,7 x 25,9 cm | 10,9 x 10,2 inches | 150dpi

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. 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

Parole chiave associate all'immagine

• bookauthorbeebewil
• bookcentury1900
• bookdecade1900
• bookyear1906