While at Yellowstone we watched a fourth of July celebration happening in a near by town.....some folks were riding in inner-tubes down the Madison just outside the park, when a girl started screaming, the inner-tube rolled and she was still screaming.When she was finally assisted back to shore she had blood coming from one side of her torso where OTTERS attacked her. Forest Ranger told us they thought that maybe the MOMMY OTTER didn't like humans floating near by her brood. The girl suffer some rather MEAN bites.