. Elements of biology; a practical text-book correlating botany, zoology, and human physiology. Biology. 294 ZOOLOGY in man are here in part lost and partly grown together. Scales are found on the ankle and foot; in very early life they resemble feathers, both in appearance and manner of growth. If mounted specimens are obtainable, notice the different feet in different birds. Some have the foot adapted to perching, others for swimming, others wading, etc. Take some one ex- ample and attempt to explain all the devices which serve to adapt the foot to its use. Is there anything in the life of t
. Elements of biology; a practical text-book correlating botany, zoology, and human physiology. Biology. 294 ZOOLOGY in man are here in part lost and partly grown together. Scales are found on the ankle and foot; in very early life they resemble feathers, both in appearance and manner of growth. If mounted specimens are obtainable, notice the different feet in different birds. Some have the foot adapted to perching, others for swimming, others wading, etc. Take some one ex- ample and attempt to explain all the devices which serve to adapt the foot to its use. Is there anything in the life of the bird that would make the correlation of the adaptation of the foot for scratching and perching ? Note the method of walking in a sparrow, robin, and pigeon. What is there about the position or structure of the leg that adapts it for walking or hop- ping? In the ostrich and cassowary the wings are not used for flight;. Explain, after reading the paragraph on adaptation in the lower limbs, how each of the above feet are fitted to do their work. From photograph loaned by the American Museum of Natural History. here the lower limbs have taken up the function of rapid motion. Notice any adaptations for aquatic life that you may find, and explain in each case how the part described is fitted for the work to be done. The foot of the common barnyard duck, for example, is much like that of the alligator. The Skeleton.—The whole skeleton combines Hghtness, flexi- bihty, and strength. Many of the bones are hollow or have large spongy cavities. The bones of the head and neck show many and varied adaptations to the life that the bird leads. The vertebrae which form the framework of the neck are strong 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 Hunter, George William, 1873-1948. New York, American book comp
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