By Brenna Owen Colorado wildlife officials say the capture of 15 grey wolves in British Columbia and their release in the U.S. state is complete, an operation they say led to unspecified threats against staff. The operation that began in B.C. on Jan. 10 and wrapped up on Saturday follows Colorado voters’ approval of a 2020 ballot initiative to reintroduce grey wolves to the state, where the animals are listed as endangered. But the program has stirred opposition, and a statement from Colorado Parks and Wildlife on Sunday says its staff have been threatened over the relocations. It says its offices were “watched” and targeted by threatening phone calls and social media posts. The department says it did not share details while the wolf release was underway due to the…