Elephants (IMAGE) University of Zurich Caption Elephants increase greatly in weight over the course of their lives -- from a starting weight of 100 kilograms to several tons in adulthood. Credit (Image: Christian Schiffmann) 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.