Illustration (IMAGE) Field Museum Caption An illustration of the newly described Avisaurus darwini, whose unusual foot bones indicate that it was one of the earliest birds of prey known to science, shown here carrying a small mammal. Credit Illustration by Ville Sinkkonen Usage Restrictions Please include credit License Original content 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.