River crossing (IMAGE) Colorado State University Caption As several families cross the Ewaso Ngiro River, a female elephant responds to her calf’s distress call. Credit: George Wittemyer Credit George Wittemyer Usage Restrictions None License Original 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.