. The bird, its form and function . ^ of the wings, together with therotary movement at the shoulder-joint, make the propellerof a ship an apt simile. The colour of the feather-scaleson the upper side of the wing is dark, like the back ofthe bird, but those on the under side have run rampant,the white and black being mLxed irregularly, not corre-sponding even in the two wings of an individual bird. The outline of the wing is exactly like that of a sharksfin, the flatness and breadth including even the bones,while (also like a fin) all of the bending quality of a wing. m in ac o 342 The Bird is
. The bird, its form and function . ^ of the wings, together with therotary movement at the shoulder-joint, make the propellerof a ship an apt simile. The colour of the feather-scaleson the upper side of the wing is dark, like the back ofthe bird, but those on the under side have run rampant,the white and black being mLxed irregularly, not corre-sponding even in the two wings of an individual bird. The outline of the wing is exactly like that of a sharksfin, the flatness and breadth including even the bones,while (also like a fin) all of the bending quality of a wing. m in ac o 342 The Bird is lost,—all the flexibility of wrist and elbow. Withthese propellers the penguins fly through the water, withalmost the identical motion of a bird in the air. Thoughit is usually asserted that the wings move alternately,this was never the case with a pair of Black-footed Pen-guins which I carefully observed. As regards the speedof swimming, I found that one of these birds, though inbad health at the time and so weak that it could takebut a few steps on land, was able to progress under water
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Keywords: ., bookcentury1900, bookdecade1900, bookpublishernewyo, bookyear1906
