Pic 2 (IMAGE) University of the Witwatersrand Caption The dietary migration of Impala in South Africa's Kruger National Park involves a change between grass to browsing leaves between seasons. Credit Gareth Hempson/Wits University 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.