. British birds. Birds. W. p. PVCRAFr : NESTLING BIRDS. 163 "under-fur" of'down in adult life. But they do not occur in all species which possess such down. The nestling-down of the Duck, for instance, is made up entirely of pre-pennce. It is impossible to distinguish in any given nestling between pre-plumulce and pre-pennce, except in individuals which are just developing teleoptyles or contour-feathers, when, in addition to the downy-tufts which will in such. Fig. 3.—A Fre-jienna of a Barn-Owl, disintegrated, and being replaced by a Contour-Feather. birds be found adhering to the t
. British birds. Birds. W. p. PVCRAFr : NESTLING BIRDS. 163 "under-fur" of'down in adult life. But they do not occur in all species which possess such down. The nestling-down of the Duck, for instance, is made up entirely of pre-pennce. It is impossible to distinguish in any given nestling between pre-plumulce and pre-pennce, except in individuals which are just developing teleoptyles or contour-feathers, when, in addition to the downy-tufts which will in such. Fig. 3.—A Fre-jienna of a Barn-Owl, disintegrated, and being replaced by a Contour-Feather. birds be found adhering to the tips of the contour- feathers, as shown in Fig. 3, there may be found similar tufts adhering to the tips of the budding adult down- feathers. But the study of the nestling-down embraces more curious facts than these, and happily all that are essential are illustrated in the birds of our own Islands. These facts are as Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original London, Witherby & Co
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Keywords: ., bookcentury1900, bookdecade1900, bookpublisherl, booksubjectbirds
