English: Title: Elements of zoölogy

Identifier: elementsofzology00hold Year: 1884 (1880s) Authors: Holder, Charles Frederick, 1851-1915; Holder, Joseph Bassett, 1824-1888, joint author Subjects: Zoology Publisher: New York : D. Appleton and company Contributing Library: The Library of Congress Digitizing Sponsor: The Library of Congress

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Text Appearing Before Image: KEEL-BREASTED BIRDS. 237 powerful, and provided with only two toes, the inner one being twice as long as the outer. Value.—The oil, skin (leather), and feathers are all used, triches are now farmed in this country for their feathers. Os-

Text Appearing After Image: Fig. 277.—Ostrich (Struthio camelus) running at full speed. Sub-Class IV.—Keel-breasted Birds {Carinatce). General Characteristics.—All the rest of the birds are included in this class. They are distinguished by a keeled sternum or breastbone, the fore-limbs in the higher forms being developed as organs of flight. Order I. Penguins (Sp/ienisci).—The Penguins (Fig. 278) are confined to the Antarctic region, and are remark- ably fish-like in their habits. The wings are small, and cov- ered with scale-like feathers, and are used, as well as their webbed feet, as paddles. The king-penguin {Aptenodytes longirostris) is one of the largest, attaining a height of three

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