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Photo courtesy of Chicago Zoological Society/Brookfield Zoo.
San Diego, California 1931-1940. On October 5, 1931, two young gorillas were received by the San Diego Zoo from Martin and Osa Johnson. The Zoo believed they were Mountain Gorillas (Gorilla gorilla beringei). Based on a paper by author Don Cousins, Classification of captive gorillas (International Zoo Yearbook, Vol. 14, 1974 pp 155-159) these two males were probably Eastern lowland gorilla (G.g. graueri).
Author: Belle J. Benchley
Published Date: 1940
How to Exhibit a Bullfrog: A Bed-Time Story for Zoo Men.
Written By: William G. Conway (Director, New York Zoological Society)
Published Date: 1968
An annual assemblage of information and facts by the American Association of Zoological Parks and Aquariums.
Edited by: Will O. Doolittle (Managing Editor, Parks & Recreation)
Published Date: 1932