Hikers in Papua New Guinea heard the “harsh” sound coming from the treetops and followed it. Take a look at what they discovered.

Many scientists believe the red-eyed tree frog ... tropical lowlands from southern Mexico, throughout Central America, and in northern South America. Nocturnal carnivores, they hide in the rain ...

Hiking through the dense rainforest of Madagascar ... During the visits, a group of small brown tree frogs caught their attention. These frogs were supposedly one known species, but researchers ...

The team collected over 130 of these Ecuadorian tree frogs by combing museum archives, searching the rainforest and raising ... Photos show the brown coloring of the new species.