Calcaivis (IMAGE) Field Museum Caption An illustration of Calcaivis, an early relative of ostriches and cassowaries that lived 52 million years ago, showing its iridescent feathers. Credit Velizar Simeonovski Usage Restrictions Please include credit to Velizar Simeonovski License Licensed 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.