Dallas Zoo officials returned two male lions to public view Wednesday, three days after they were involved in a fatal attack on a female lion named Johari. The males have been separated from the remaining two females, and officials are discussing the lion exhibit's future. Such fatal attacks are rare, but they do occur, as in an October incident at the Cheyenne Mountain Zoo in Colorado that left a 6-year-old female lion dead. Lion expert Craig Packer believes the attack on Johari was likely an aberration. "I don't see how the zoo could be blamed," he said. The lions will not be euthanized, said zoo officials.