This interesting study sets gorilla and orangutan cognitive abilities in context with the other great apes and humans.
This volume begins by setting recent research on orangutans and gorillas in a context for comparing it to chimpanzees and humans. These introductory pieces are followed by discussions of the kinds and levels of orangutan and gorilla intelligence compared to other great apes. Specialists in anthropology, evolution, psychology, and primate research, examine orangutan and gorilla performances in areas such as tool use and tool making, imitation, self-awareness, social communication, and symbol use, and conclude that all great apes have attributes that have commonly been associated only with chimpanzees. Annotation c. Book News, Inc., Portland, OR (booknews.com)