Two Male Fallow Deer in Competition (video) Queen Mary, University of London Loading video... Caption The clip shows the typical interaction between two bucks where calling is involved. The two males walk parallel to each other while calling. This allows them to size each other up before escalating to fighting or not. Credit Queen Mary University of London Usage Restrictions Please credit Queen Mary Univeristy of London 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.