If animal rights issues are a serious part of the sales slump, SeaWorld could be in deep water. Attention around the treatment of animals began to swirl after last year's release of "Blackfish," a documentary focused on alleged mistreatment of killer whales at SeaWorld parks. More recently, Southwest Airlines decided to remove SeaWorld animal images from a few of its planes. Animal rights groups have a tenacious following and they will likely continue to host protests that attract media attention.