Fossil Reconstruction (image) American Association for the Advancement of Science Share Print E-Mail Caption Like most early nocturnal mammals, Rugosodon eurasiaticus was active at night. This reconstruction shows Rugosodon searching for food among ferns and cycads on the lake shores in the darkness. Credit [Illustration by April Isch, University of Chicago] Usage Restrictions May be used only with permission 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.