Trichromat (IMAGE) University of Exeter Caption Nightjar as seen by a trichromat (the bird is almost exactly in the center of the image, facing right). Credit University of Exeter Usage Restrictions Only for use with reports of this research 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.