By Jason Hall Photo: Getty Images The National Park Service is warning visitors to avoid pushing their friends down in areas with bears around. Park rangers shared a post on the National Park Service's verified Facebook account on Sunday (June 13) detailing what to do if facing a situation in which you get too close to a bear. “If a bear clacks its teeth, sticks out its lips, huffs, woofs, or slaps the ground with its paws, it is warning you that you are too close and are making it nervous,” the National Park Service said in the post. “The bear’s nervous? Heed this warning and slowly back away.”