Imapala (IMAGE) Cell Press Caption This is a photograph of impala. A third of all antelope species are now listed as threatened on the IUCN Red List. Credit Jakob Bro-Jørgensen Usage Restrictions Credit Required. 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.