. Chimpanzee intelligence and its vocal expressions. Chimpanzees; Animal intelligence; Sound production by animals. Sans Tache. 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

---

Size: 1377px × 1816px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No

Keywords: ., bookcentury1900, bookdecade1920, booksubjectanimalintelligence