Hidden worlds of wildlife / prepared by the Special Publications Division, National Geographic. Society, Washington, D.C. National Geographic Society (U.S.). Special Publications Division. Animals. Animals Pictorial works. QL50 .H49 1990 591 20 "Special publications 25th anniversary"--Cover. Includes bibliographical references (p. 199) and index. Washington, D.C. : The Society, c1990. c1990. 1990 Text 199 p. : eng