Male Lizard Threat Display (IMAGE) University of Chicago Press Journals Caption The colorful and robust head of an adult male eastern collard lizard (Crotaphytus collaris) from the Wichita Mountains National Wildlife Refuge. The partially unfolded, bright white mouth-corner patch accentuates the jaw muscles during gaping displays. Credit Courtesy A.K. Lappin Usage Restrictions None 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.