Pronghorn are the fastest animals in North American, but they can't outrun human development, like that seen in the Pinedale Anticline natural gas field in Wyoming in 2008. Like greater sage-grouse, mule deer and hundreds of other species, pronghorn need wide-open expanses of healthy sagebrush to thrive. Human development and infrastructure can displace wildlife and render habitat unsuitable for greater sage-grouse and other sagebrush-obligate species.