Tiger Snake (2 of 2) (image) University of Chicago Press Journals Caption Some tiger snake populations on Australian islands have evolved to be giants, nearly twice the size of their mainland counterparts. New research in the American Naturalist suggests that the need to have big-mouthed babies drove the evolution of these enormous elapids. Credit Fabien Aubret Usage Restrictions None 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.