<em>Catocala nupta</em> (IMAGE) Helmholtz Centre for Environmental Research - UFZ Caption The Red Underwing (Catocala nupta) -- is on rotten fruit sucking. The moths was named after its distinctive red color. In the study this species showed no variability. That means, the population fluctuated stronger than species with high variability in color and drawing. Credit Photo: Martin Wiemers/ UFZ 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.