Yellowstone Pronghorn (image) Wildlife Conservation Society Caption Yellowstone pronghorn populations directly benefit from the presence of wolves, a new Wildlife Conservation Society study says. Credit Julie Larsen Maher/Wildlife Conservation Society Usage Restrictions Image to be used only for breaking news stories on WCS study. 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.