Lemurs can smell weakness in each other

(Duke University) Some people watch the competition carefully for the slightest signs of weakness. Lemurs, on the other hand, just give them a sniff. These primates from Madagascar can tell that a fellow lemur is weaker just by the natural scents they leave behind, finds a study on ring-tailed lemurs led by Duke University researchers. The study reveals that getting hurt dampens a lemur's natural aroma, and that males act more aggressively toward scents that smell "off."

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