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Non-human primates

Non-human primates display signs of disgust and aversion to biological contaminants. Exposure to bodily excrements that usually elicit disgust reactions in humans, such as feces, semen, or blood, have an impact on primates' feeding preferences. Chimpanzees generally avoid the smells of biological contaminants, but only show a weak tendency to move away from these odors, possibly because olfactory stimuli are not enough to give chimps a high enough threat level to move away. Chimpanzees physically recoil when presented with food items on soft, moist substrates, possibly because in nature, moisture, softness, and warmth are characteristics needed to grow pathogens. These responses are functionally similar to what humans' responses would be to the same kinds of stimuli, indicating that the underlying mechanism for this behavior is similar to ours.