Beginners' zoology . (Fig. 369.) In-stead of feathers, the flying organs are made of a pairof ^extended folds of the skin supported by elongatedbones, which form a framework like the ribs of an um-brella or a fan. How many digits are prolonged . Does MAMMALS 203. FiG. 370.—Vampire {Phyllostoma spectrum) of South America, x ^. the fold of the skin extend to the hind legs ? The tail ?Are the finger bones or the palm bones more prolongedto form the wing skeleton ? The skin of the wing is rich in blood vessels and nerves,and serves, by its sensitiveness to the slightest current ofair, to guide the
Beginners' zoology . (Fig. 369.) In-stead of feathers, the flying organs are made of a pairof ^extended folds of the skin supported by elongatedbones, which form a framework like the ribs of an um-brella or a fan. How many digits are prolonged . Does MAMMALS 203. FiG. 370.—Vampire {Phyllostoma spectrum) of South America, x ^. the fold of the skin extend to the hind legs ? The tail ?Are the finger bones or the palm bones more prolongedto form the wing skeleton ? The skin of the wing is rich in blood vessels and nerves,and serves, by its sensitiveness to the slightest current ofair, to guide the bat in the thickest darkness. Would youjudge that the bat has sharp sight .-^ Acute The moles do not hibernate; the bats do. Give thereason for the difference. If bats are aroused out of atrance-like condition in winter, they may die of ? The mother bat carries the young about with her,since, unlike birds, she has no nest. How are the youngnourished . Order WJiy ? (Key, p. 193.) The Gnawing Mammals. —These animals form the mostnumerous order of mammals. They lack cajiine teeth. In-ference . The incisors are four in number in all species 204 HECINNERS ZOO LOG V except the rabbits, which have six (see Fig. 345). Theyare readily
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectzoology, bookyear1921
