Says their treatment violates 13th amendment
                                
                                
                                    (Newser) -
                                    Never known for  half-measures , PETA is suing SeaWorld—for violating the 13th Amendment. You know, the one that outlawed slavery. In a federal lawsuit filed on behalf of killer whales Tilikum, Katina, Corky, Kasatka, and Ulises, the animal rights group contends that SeaWorld keeps its orcas in conditions that violate...