Frog call (AUDIO) University of Copenhagen - Faculty of Science Your browser does not support the audio element. Caption The otherworldly calls of these frogs are known as "advertisement calls"—a type of self-promotion that, according to the researchers, may convey information about the male frog’s suitability as a mate to females. This particular group live along fast-flowing streams in the most mountainous regions of Madagascar—a loud background that may explain why the frogs call at such high pitches. Credit Mark D. Sherz Usage Restrictions Use with credit License Original 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.