Image 1 (IMAGE) Max Planck Institute of Geoanthropology Caption Weidende Rinder in Entesekara in Kenia nahe der tansanischen Grenze Credit A. Janzen Usage Restrictions Please provide credit information with reuse 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.