Ibis Flying in Formation (IMAGE) University of Oxford Caption Ibis take turns saving energy by following in another bird's wake, according an Oxford University-led study. It is thought to be the first example of 'turn taking' reciprocal cooperative behaviour in birds. Credit M Unsöld Usage Restrictions To illustrate 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.