Etosha (2 of 2) (IMAGE) Helmholtz Association Caption For the study, the researchers selected an area measuring 500 by 500 m in Etosha National Park because it has one dominant grass species and because it was possible to rule out interference such as grazing and other human influences. Credit Julia Zimmermann/UFZ 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.