Tiny Fossils Reveal How Shrinking Was Essential for Successful Evolution (image) University of Birmingham Share Print E-Mail Caption Life reconstruction of the mammaliaform Morganucodon found in Jurassic sediments of Wales and China. Morganucodon was one of the smallest fossil mammal ancestors with a size of 4-6cm. Credit Bob Nicholls, Paleocreations.com Usage Restrictions Please note: all images are for single use only to illustrate this press release and are not to be archived. Please credit the copyright holder in each case. Share Print E-Mail 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.