Wonderchicken Skull (image) University of Cambridge Share Print E-Mail Caption Three-dimensional image of the skull of the world's oldest modern bird, Asteriornis maastrichtensis. The fossil is 66.7 million years old and is close to the most recent common ancestor of duck-like birds and chicken-like birds. 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.