Sex in the City -- Tungara 1 (IMAGE) Smithsonian Tropical Research Institute Caption Tungara frogs sound like pinball machines. They start with the sound TUN, and can add several GARAS to make the sound TUN GARA GARA. Frogs living in the city make more calls, and more complex calls (more GARAS), than frogs living near the tropical forest. Credit Marcos Guerra, STRI Usage Restrictions Credit: STRI 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.