. Elements of zoölogy : a textbook. Zoology. 144 VERTEBRATA: AVES OR BIRDS. TIG. I .„ 3 w 1 o. SkuU of a Bird—Eagle. ossified throughout their whole length, in order to give greater strength to the trunk; and a small bone is at- tached obliquely across each rib, which also contributes to the same result. Regarding the wrist as part of the hand, each wing is made up of three sections,—the arm, forearm, and hand, —thus corresponding to the anterior extremities of man and other mammals. The hind locomotive members of Birds are each com- posed of a femur, a tibia and fibula, the last two mor
. Elements of zoölogy : a textbook. Zoology. 144 VERTEBRATA: AVES OR BIRDS. TIG. I .„ 3 w 1 o. SkuU of a Bird—Eagle. ossified throughout their whole length, in order to give greater strength to the trunk; and a small bone is at- tached obliquely across each rib, which also contributes to the same result. Regarding the wrist as part of the hand, each wing is made up of three sections,—the arm, forearm, and hand, —thus corresponding to the anterior extremities of man and other mammals. The hind locomotive members of Birds are each com- posed of a femur, a tibia and fibula, the last two more or less united; a tarsus and metatarsus, the latter more or less merged in the former ; and generally of three toes before and a thumb behind, the latter, however, some- times 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 Tenney, Sanborn, 1827-1877. New York : Scribner
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