. Animal flight; a record of observation . Wing section of Indian Tawny Eagle (Aquila vmdiana). type. The wings of this eagle resemble those of owlsalso in that the under surface of the quill feathers issomewhat polished. Further the shafts of the primaryquills do not stand out so strongly on the underside ofthe feathers as do those of vultures and other species ofeagle that I have examined. 354 ANIMAL FLIGHT. These wing sections suggest that their possessorsmay have a somewhat good gliding angle. Withoutwishing to lay too much stress on observations on thispoint, I may state that occasionally
. Animal flight; a record of observation . Wing section of Indian Tawny Eagle (Aquila vmdiana). type. The wings of this eagle resemble those of owlsalso in that the under surface of the quill feathers issomewhat polished. Further the shafts of the primaryquills do not stand out so strongly on the underside ofthe feathers as do those of vultures and other species ofeagle that I have examined. 354 ANIMAL FLIGHT. These wing sections suggest that their possessorsmay have a somewhat good gliding angle. Withoutwishing to lay too much stress on observations on thispoint, I may state that occasionally I have seen birdswith aquiline wing sections gliding in calm air with a. Wing section of Black Vulture (Otogyps calvus) taken A m A PT:> j at junction of middle and outer thirds of forearm. tp Shaft of secondary quill. A. Air sac. L. Posterior limit of covert M. Muscle. feathers. Tensor patagii. U. Ulna. Patagial depression. R. Radius. gliding angle that appeared to me to be good, as com-pared with that of vultures when, as rarely happens,these birds glide with loss of height in unsoarable have never yet seen in eagles an increase of the angleof incidence during the glide, as usually happens inunsoarable air in the case of the heavier vultures.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectan, booksubjectflight
