Rhesus monkeys typically don?t check themselves out in a mirror ? unless they?re wearing funky acrylic forehead blocks attached to hair-thin electrodes implanted in their brains.Given that fashion-forward apparel, these monkeys avidly use mirrors to examine and groom their heads and to inspect hard-to-see body areas, say neuroscientist Luis Populin of the University of Wisconsin?Madison and his colleagues.
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