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interestingly enough, many primate species establish or maintain the social order among the extended family or the larger troop through social grooming. while we see on the outside one monkey de-lousing another this is not a mere instance of cleanliness, but the monkey nit-picking is confirming their social status in relation to the monkey being groomed.
what may be even more interesting is how the primate species Homo sapiens cannot seem to resist a little minor social grooming. ¿who hasn't picked a hair or two off the back of the person sitting in the row in front of them?
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