. Chimpanzee intelligence and its vocal expressions. Chimpanzees; Animal intelligence; Sound production by animals. y CHIMPANZEE INTELLIGENCE AND ITS VOCAL EXPRESSIONS BY ROBERT M. YERKES AND BLANCHE W, LEARNED. BALTIMORE THE WILLIAMS & WILKINS COMPANY 1925. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Yerkes, Robert Mearns, 1876-1956; Learned, Blanche W. Baltimore, The Williams & Wilkins Company

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Keywords: ., bookcentury1900, bookdecade1920, booksubjectanimalintelligence