Wonderchicken Skull Spin (video) University of Cambridge Share Print E-Mail Loading video... Caption Three-dimensional views of the skull of The Wonderchicken, Asteriornis maastrichtensis, a 66.7 million-year-old bird fossil from the end of the age of dinosaurs. It is the oldest modern bird fossil ever found. Credit Daniel J. Field, University of Cambridge Usage Restrictions None 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.