GRIZZLIES AND OTHER CARNIVORES OFTEN USE RUBBING POSTS. THE POST IN THIS PICTURE IS A 6' TOPLESS EVERGREEN IMMEDIATELY BESIDE A WELL-USED TRAIL RUNNING UP THROUGH THE CENTER OF THE PHOTO. THE BEARS STAND UP AND ENERGETICALLY RUB THEIR BACKS AGAINST THE POST DEPOSITING HAIR AND SCENT. THIS LIKELY SERVES AS A MESSAGE BOARD TO OTHER ANIMALS IN THE VICINITY COMMUNICATING THINGS LIKE GENDER AND PERHAPS HIERARCHAL POSITION.