A Face and Age for Early Mammalian Ancestor (3 of 3) (video) American Association for the Advancement of Science Share Print E-Mail Loading video... Caption Authors talk about their latest placental mammal tree of life. This video relates to a paper that appeared in the Feb. 8, 2013, issue of Science, published by AAAS. The paper, by Maureen A. O'Leary at Stony Brook University in Stony Brook, NY, and colleagues was titled, "The Placental Mammal Ancestor and the Post-K-Pg Radiation of Placentals." Credit [Video courtesy of AMNH] Usage Restrictions Please cite the owner of the video when publishing. This video may be freely used by reporters as part of news coverage, with proper attribution. Non-reporters must contact Science for 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.