Male Replicas Mimic Live Fish (IMAGE) NYU Tandon School of Engineering Caption While male blue killifish exhibit in red, blue and yellow, fertile females preferred yellow replicas, which mimicked the size, aspect ratio and colors of live fish. A research team led by New York University Polytechnic School of Engineering discovered the surprising affinity for yellow by building a robotic arm that moved the male replicas consistently throughout experiments -- something that scientists cannot do with famously erratic live male killifish. Credit NYU Polytechnic School of Engineering/Giovanni Polverino Usage Restrictions for editorial use only, when covering NYU School of Engineering 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.