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"The Mental Life of Monkeys and Apes: A Study of Ideational Behavior" by Robert Mearns Yerkes is a pioneering work in comparative psychology that explores the cognitive abilities and mental processes of non-human primates. Drawing on extensive observational studies and experiments, Yerkes examines the behavioral patterns, problem-solving skills, and social interactions of various species of monkeys and apes. His research aims to provide insights into the evolution of intelligence and the psychological similarities between humans and their primate relatives.Yerkes employs a variety of methods to study the mental life of these animals, including controlled experiments that assess their learning capabilities and memory functions. He also discusses the significance of play behavior, communication, and emotional responses in understanding the cognitive complexity of primates. The book presents a wealth of anecdotal evidence and scientific observations, making it accessible to both researchers and general readers interested in animal behavior and psychology.