. Der Vogel, seine Form und Funktion . gmem* Abb. 93 und 94.- Ober- und Seitenansicht der Zunge einer Mallard-Ente, die komplizierte Struktur in der Zunge eines Vogels zeigt, der seine Nahrung aus dem Schlamm siebt. Bei vielen Vögeln, wie z. B. Eulen, Lerchen und Mauerseglern, ist die Spitze zweispitzig, oder doppelspitzig, was an die gezähnten Zungen von Schlangen und Schlangeneidechsen erinnert. Bei Spechten ist die Zunge rund und überaus lang und kann meist über die Schnabelspitze hinaus hinaus ausgeworfen werden. Unser gewöhnlicher Flicker, oder Golden-geflügelter Specht, Organe der Ernährung 123 besitzt eine Zunge

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. The bird, its form and function . gmem* Figs. 93 and 94.—Top and side views of the tongue of a Mallard Duck, showingcomplicated structure in the tongue of a bird which sifts its food from the mud. tion as the remaining portions. In many birds, such asowls, larks, and swifts, the tip is bifid, or double-pointed, bringing to mind the forked tongues of snakes and cer-tain lizards. In woodpeckers the tongue is round andexceedingly long, and can usually be thrown out somedistance beyond the tip of the bill. Our common Flicker, or Golden-winged Woodpecker, Organs of Nutrition 123 possesses a tongue of remarkable length, even for a wood-pecker, and while feeding, the bird will often shoot it. Fig. 95.—Head of Flicker, showing tongue slightly protruding out two or three inches beyond the tip of the beak.Easily and without a hitch it disappears again, appa- Fig. 96.—Skull of Flicker, showing rear branches of the hyoid bone, curving upover the skull and down into the right nostril. The front of the tongue isvisible beyond the tip of the beak. rently down the very throat of the bird. If we carefullyremove the skin from the skull of a dead Flicker, themagic will become plain. When we spoke of the skull i 24 The Bird of a bird, mention was made of the two long bones whichbranched out from the rear of the tongue and which areall that remain of the third ancestral gill-arch. In theFlicker, the slender, white tongue divides into these twobranches just in front of the glottis and from here theyextend backward, passing one on each side of the wind-pipe, and on upward, following the curve of the skull, then forward, lying together upon the forehead. Noteven here do they end, howeve

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• bookyear1906
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