Fall is the mating season for hooved mammals in the Greater Yellowstone Ecosystem, including pronghorn antelope. Male Pronghorn (with larger horns) go to great lengths to fight over territory and have opportunities to court herds of females, but as we see here it is the ladies who are actually in charge. Female pronghorn are only receptive to mating for a short window and actively decide when and with whom they will mate with. Notice the pronghorn doe triggering a chase from the male towards the