A Chimpanzee Named Julie Began Wearing Grass in Her Ear. Years Later, Another Group Copied the Trend, and Took It Further

At a sanctuary in Zambia, a female chimpanzee picked up a stiff blade of grass and pushed it into her ear. Then she left it there. She groomed, played and rested with the grass still in place, repeating the odd routine over and over.More than a decade later, the grass turned up in a different group of chimpanzees, only now some of it was going somewhere other than their ears.