When glass frogs emerge during the rainy season, researchers at the Smithsonian Tropical Research Institute follow their migration out of the forest and along streams. These transparent leaf-lying ...

This story appears in the March 2017 issue of National Geographic magazine. These frogs put the “group” in “group sex”—and that helps them thrive. Of all vertebrates, gray foam-nest tree ...

The calling animal turned out to be a new species. A team of researchers set out to study the hourglass tree frog, a “small, brightly colored species” found in Central and South America.

Instead, the hollow interior fills with water and provides a home for new life to begin — via frog eggs. A new species of tree frog was discovered laying its eggs in the tiny bamboo shaft ...