File:The bird, its form and function (1906) (14568937128).jpg

Identifier: birditsformfunct07beeb (find matches)
Title: The bird, its form and function
Year: 1906 (1900s)
Authors: Beebe, William, 1877-1962
Subjects: Birds Birds
Publisher: New York : Henry Holt
Contributing Library: Internet Archive
Digitizing Sponsor: Internet Archive

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Text Appearing Before Image:
t in most ofthe ostrich-like birds, the tinamous, and in reptiles,where these bones are free throughout their entire length.We can readily make out the pubis as a slender bar of 9° The Bird Pu, Fig. 63 bone extending backward from the thigh-socket, sepa-rated from the ischium(except at the extremeend) by a long open slit.In other animals thesebones are as different inshape as can be imagined,but, almost without excep-tion, the position of eachis relatively the same. Theextreme extension, forwardand back, of the iliumabove the back-bone, thusjoining with more vertebrae,is directly connected withtwo-legged erect locomo-tion. A parallel conditionis found in some Dinosaurs—those extinct giant rep-tiles — certain of whichwalked more or less ontheir hind legs. Another fundamentalresemblance is found be-tween the thigh-girdles ofDinosaurs and other rep-tiles and that of a bird inthe egg. As is shown inFigs. 63-65, the pubis slants slightly forward in both reptile and embryo bird; but in
Text Appearing After Image:
Fig. 64.—Pelvic arch of an embryo bird,to show similarity of the two ascontrasted with Fig. (5.

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