Female Barred Buttonquail (IMAGE) Max-Planck-Gesellschaft Caption Female barred buttonquails: the size and color intensity of their black throat patch is determined by their testosterone levels. Credit Cornelia Voigt, MPI f. Ornithology 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.