Chimpanzees at Zambia's Chimfunshi Wildlife Orphanage have developed an unusual social trend of placing blades of grass in their ears and even their buttocks. Scientists found that the behavior has no practical purpose and spreads through social learning, much like human fashion trends. Researchers believe it may help strengthen social bonds and express group identity among captive chimpanzees. Credit: Jake Brooker / Chimfunshi Wildlife Orphanage Trust Source (MLA): Live Science. "Chimps Develop Fashion Trend by Shoving Grass in Their Ears and in Their Butts." Want more interesting content like this ? Follow gravitonomy :) #chimpanzees #anthropology #science #behavioranalysis #primates