File:Image from page 343 of "Introduction to zoology; a guide to the study of animals, for the use of secondary schools;" (1900) (14598629837).jpg

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Identifier: introductiontozo00dave Title: Introduction to zoology; a guide to the study of animals, for the use of secondary schools; Year: 1900 (1900s) Authors: Davenport, Charles Benedict, 1866-1944 Davenport, Gertrude Anna Crotty, 1866- Subjects: Zoology Publisher: New York, Macmillan company London, Macmillian and co., ltd. Contributing Library: MBLWHOI Library Digitizing Sponsor: MBLWHOI Library


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Text Appearing Before Image: FIG. 298. — ij* rirgittlana, the North American opossum. AfterVogt and Specht. have been killed off from the connecting continents. Thesloths have incisor teeth, live in trees, and eat leaves (Fig.299). The armadillos are protected by strong plates de-veloped in the skin ; they are chiefly nocturnal and om-nivorous animals, and burrow rapidly. The other threefamilies feed on ants and termites, lack complete teeth (ex-cepting the aardvarks), and are either arboreal or burrowing. 1 e, out ; dens, dent is, tooth. 324 ZOOLOGY The Cetacea1 have taken to an aquatic life, for it iscertain that their ancestors were land animals. The sea-cows (manatees2), found in rivers in various parts of theworld, seem8 to show a transition to the marine forms,

Text Appearing After Image: FIG. 299. —Choloepus, the unau or two-toed sloth. After Vogt and Specht. such as the dolphins, the toothed whales (Fig. 300),and the toothless or whalebone whales. The largest ofthese whales - - the Greenland whale - - reaches an ex-treme length of twenty-two to twenty-four metres, and a 1 cetus, whale. 2 From a native name. 3 The relation to Cetacea is not close. THE MOUSE AND ITS ALLIES 325 weight of over 100,000 kilogrammes. It is, indeed, thelargest living animal. Although whales in general arepartly adapted to an aquatic life, they still retain theessential mammalian qualities. They breathe air whichpasses to the lungs and is expelled again through thenostrils, which are placed high up on the head. The blowing of the whale is the forcible expiration ofmoisture-laden air, which becomes visible by condensation,


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