With the arrival of a new male wolf last month, Brookfield Zoo plans to establish a new pack of endangered Mexican wolves. Zoo officials said this week they are hopeful that 2-year-old Ela and newcomer Apache, 7, will have a successful breeding season this winter and produce a litter of wolf pups in the spring.Apache arrived at the zoo in December from Albuquerque Bio Park in New Mexico. Brookfield Zoo was home to Ela’s original pack until November, when nine wolves were transferred to new homes in Missouri. Ela’s packmates were moved because as wolves mature, they typically disperse from their natal pack. The 10-wolf pack was one of the largest and most successful packs in the history of the Mexican Wolf Recovery Program, according to the zoo.