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The hearing of other species in the division of mammals to which humankind belongs has always been of special interest. A number of species have been studied, including monkeys, marmosets, and chimpanzees among the primates considered as the most advanced, the anthropoids; and tree shrews, lemurs, and lorises among the more primitive. By using a variety of training methods with chimpanzees, monkeys, and marmosets, behavioral thresholds have been recorded in response to sounds of different intensities and frequencies. When compared with each other and with humans, it has been found that the hearing sensitivity of these animals and humans is ...(100 of 14389 words)