Pronghorn (IMAGE) Wildlife Conservation Society Caption Pronghorn wintering grounds have declined by 85 percent in Wyoming's two largest gas fields, a new study has found. Credit Julie Larsen Maher © WCS Usage Restrictions None 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.