Opsin Comparison (image) University of Maryland Share Print E-Mail Caption This graphic compares the light spectrum visible to three South American cichlid species (left) with the spectrum visible to many African species (right). South American cichlids have visual systems adapted to the red-shifted light environment of murky Amazonian waters. Credit Daniel Escobar-Camacho Usage Restrictions None Share Print E-Mail 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.