Researchers have discovered seven new species of tree frogs that make otherworldly calls in the rainforests of Madagascar. Their strange, high-pitched whistling calls sound more like sound effects ...

All over the world, different types of frogs call out in various ways to warn others or attract mates Olivia Ferrari Different species of frogs call out in various ways, and they may sound like ...

On a private nature reserve in Costa Rica, Donald Varela-Soto searched for the source of a shrill frog call for six months. What he found turned out to be a new species, a tiny green tree frog that ...