In 2007, a 15-year-old chimpanzee named Julie started sporting a stiff blade of grass behind one ear — a trend that drove her fellow apes wild.

First, her son donned his own ear ornament, followed by eight other chimps in Julie’s troop of 12, who all lived in a sanctuary in Zambia.

When Julie died in 2012, her local gang kept wearing the single-blade accessory, and the style eventually spread to fashion-forward chimps in two nearby populations.
Bonobos engage in some type of sex act an exhausting 10 times a day yet have babies just once every five or six years. A bonobo bundle of joy comes along only once out of 18,250 sex acts, while humans conceive roughly once out of every 1,000 acts of heterosexual intercourse.
https://nypost.com/2019/04/06/why-so...-just-for-fun/