Pronghorn Antelope (IMAGE) Wildlife Conservation Society Caption Pronghorn antelope is the longest land migrant in the contiguous USA (photo from south of Grand Teton National Park). Credit Joel Berger Usage Restrictions For use in reporting this story 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.