Robofrog (IMAGE) University of Texas at Austin Caption In an innovative experiment, biologists Michael Ryan and Ryan Taylor used recordings of male tungara frog mating calls, along with a robotic frog that can inflate its vocal sac, to investigate how visual and auditory signals can combine to attract females. Credit Michael Ryan, University of Texas at Austin 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.