[Illustration: TROPICAL AMERICAN HUMMING-BIRDS] YOUNG FOLKS' TREASURY In 12 Volumes HAMILTON WRIGHT MABIE _Editor_ EDWARD EVERETT HALE _Associate Editor_ The Animal World A Book of Natural History _By_ THEODORE WOOD _Edited by_ ERNEST INGERSOLL VOLUME V NEW YORK THE UNIVERSITY SOCIETY INC. _Publishers_ COPYRIGHT, 1909, BY THE UNIVERSITY SOCIETY INC. PARTIAL LIST OF CONTRIBUTORS, ASSISTANT EDITORS AND ADVISERS HAMILTON WRIGHT MABIE _Editor_ EDWARD EVERETT HALE _Associate Editor_ NICHOLAS MURRAY BUTLER, President Columbia University. WILLIAM R. HARPER, Late President Chicago University. HON. THEODORE ROOSEVELT, Ex-President of the United States. HON. GROVER CLEVELAND, Late President of the United States. JAMES CARDINAL GIBBONS, American Roman Catholic prelate. ROBERT C. OGDEN, Partner of John Wanamaker. HON. GEORGE F. HOAR, Late Senator from Massachusetts. EDWARD W. BOK, Editor "Ladies' Home Journal." HENRY VAN DYKE, Author, Poet, and Professor of English Literature, Princeton University. LYMAN ABBOTT, Author, Editor of "The Outlook." CHARLES G. D. ROBERTS, Writer of Animal Stories. JACOB A. RIIS, Author and Journalist. EDWARD EVERETT HALE, Jr., English Professor at Union College. JOEL CHANDLER HARRIS, Late Author and Creator of "Uncle Remus." GEORGE GARY EGGLESTON, Novelist and Journalist. RAY STANNARD BAKER, Author and Journalist. WILLIAM BLAIKIE, Author of "How to Get Strong and How to Stay So." WILLIAM DAVENPORT HULBERT, Writer of Animal Stories. JOSEPH JACOBS, Folklore Writer and Editor of the "Jewish Encyclopedia." MRS. VIRGINIA TERHUNE ("Marion Harland"), Author of "Common Sense in the Household," etc. MARGARET E. SANGSTER, Author of "The Art of Home-Making," etc. SARAH K. BOLTON, Biographical Writer. ELLEN VELVIN, Writer of Animal Stories. REV. THEODORE WOOD, F. E. S., Writer on Natural History. W. J. BALTZELL, Editor of "The Musician." HERBERT T. WADE, Editor and Writer on Physics. JOHN H. CLIFFORD, Editor and Writer. ERNEST INGERSOLL, Naturalist and Author. DANIEL E. WHEELER, Editor and Writer. IDA PRENTICE WHITCOMB, Author of "Young People's Story of Music," "Heroes of History," etc. MARK HAMBOURG, Pianist and Composer. MME. BLANCHE MARCHESI, Opera Singer and Teacher. CONTENTS PAGE Introduction xi CHAPTER I Apes and Gibbons 1 II Baboons 7 III The American Monkeys and the Lemurs 16 IV The Bats 26 V The Insect-Eaters 33 VI The Larger Cats 47 VII The Smaller Cats 60 VIII The Civets, the Aard-Wolf, and the Hyenas 68