It's mating season for pronghorn antelope in the Greater Yellowstone Ecosystem. Check out these two clips of mating behavior. In the first clip, a buck pronghorn has scent marked some vegetation, picking up an impressive mass of vegetation on his horns. In the second, an aggressive buck chases a younger male, demonstrating a taste of speed at which these animals can run! Observed on a recent safari in Grand Teton National Park. www.jhecotouradventures.com | Jackson Hole EcoTour Adventures