Cockatiels (IMAGE) University of New South Wales Caption A flock of Cockatiels. Credit Corey T. Callaghan Usage Restrictions Photo can only be used with credit and in relation to this story. 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.