. The Avicultural magazine. Birds; Cage birds. 302 On a Nestling Calopsittacus novcs-hollandice. hollow : while the inferior border of the jaw in the adult is semicircular, in the nestling straight, until near the tip. The fact that the external nostrils open at a point above the angle of the gape in the adult, and much in advance of this in the nestling, suggests considerable differences in the relative rates of growth of the several parts of the jaws between the nestling and adult stages. Observations on this point are evidently much needed. As to the significance of these changes nothing ca
. The Avicultural magazine. Birds; Cage birds. 302 On a Nestling Calopsittacus novcs-hollandice. hollow : while the inferior border of the jaw in the adult is semicircular, in the nestling straight, until near the tip. The fact that the external nostrils open at a point above the angle of the gape in the adult, and much in advance of this in the nestling, suggests considerable differences in the relative rates of growth of the several parts of the jaws between the nestling and adult stages. Observations on this point are evidently much needed. As to the significance of these changes nothing can profitably be said at this juncture. But it would seem that the curious spoon-shaped tip of the upper jaw of the nestling may represent a stage in the ancestral history, when the jaws were used for softer 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 Avicultural Society. [Ascot, Berkshire, etc. : Avicultural Society, etc. ]
Size: 1133px × 2206px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, booksubjectbirds, bookyear1894
