Pronghorn and Gas Field (IMAGE) Wildlife Conservation Society Caption A recently published five-year study by the Wildlife Conservation Society examined potential threats such as natural gas development and highways to the migratory movements of pronghorn antelope in the Upper Green River Basin. Credit Jeff Burrell/Wildlife Conservation Society. Usage Restrictions One-time usage only. License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.