Pigeon Patterns (IMAGE) University of Utah Caption Many domesticated rock pigeons have the following four coloration patterns on their wings with different amounts of pigmentation: the darkest "T-check" pattern (top left), the slightly less dark "checker" pattern (top right), the ancestral "bar" pattern (bottom left) , and the lightest "barless" pattern (bottom right). Credit Genetic Science Learning Center, University of Utah Usage Restrictions non commercial with attribution 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.