Fashion Statement?

 Remember the orcas swimming around with dead salmon on their heads for no apparent reason? Well this is a similar deal, only this time it's chimps. Usually animal behavior centers around finding food or other survival skills which doesn't help explain why chimps at a wildlife orphanage in Zambia started putting blades of grass or sticks in their ears or rectum. The grass in the ear behavior was first noticed in 2014 and was only one group of chimps, then recently another group was seen doing the same thing. The only thing the two groups have in common is their caretakers who admitted to sometimes using a blade of grass or a matchstick to clean their ears though that would explain the grass in the ear for the chimps, I doubt it explains the grass/sticks in the rectum. Then again, who knows?