. The bird, its form and function. Birds. 2o6 The Bird sense of smell most acutely developed, although in both cases it is the delicate nerves of touch in the bill which are most helpful in detecting the presence of the earth- worms which constitute the food of these birds. To whatever degree the nostrils of land birds aid their owners in procuring food, it is certain that those. Fig. 150.—Head of Apterys, .showing tactile hair-like feathers, nostrils at tip of beak, and small eyes. species which feed entirely on fish, which they swallow whole, have little use for nostrils, except for breathin
. The bird, its form and function. Birds. 2o6 The Bird sense of smell most acutely developed, although in both cases it is the delicate nerves of touch in the bill which are most helpful in detecting the presence of the earth- worms which constitute the food of these birds. To whatever degree the nostrils of land birds aid their owners in procuring food, it is certain that those. Fig. 150.—Head of Apterys, .showing tactile hair-like feathers, nostrils at tip of beak, and small eyes. species which feed entirely on fish, which they swallow whole, have little use for nostrils, except for breathing. Thus Nature, ever on the watch to economize, has re- duced these organs, in such birds as pelicans and cor- morants, and, at least in the adults, the nostrils are com- pletely filled up with bone and 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 Beebe, William, 1877-1962. New York, Holt
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectbirds, bookyear1906
