Investigators are searching for the poachers responsible for killing four elk in a California national park. The dead Roosevelt elk were found July 21 in the Redwood National Park in Crescent, California, where hunting is prohibited by federal and state law, according to park officials. Officials did not elaborate on a motive or charges the poachers may face, but noted no meat had been taken. It was also determined the elk, who are typically a game species, were killed with lead shot, which is the “single largest threat to free-flying California condors” when ingested, they said. “Poaching and…