The metallic poison frog, active during daytime hours, has a long-lasting trill, or call, of 21–45 notes. While perched on leaves, the males begin calling out at dawn and vocalize for several hours ...

New photos captured by NASA’s Mars Reconnaissance Orbiter (MRO) reveal the first known imagery of the intrepid Curiosity ...

Recent flybys of the fiery world refute a leading theory of its inner structure — and reveal how little is understood about ...

Discover what it's like to sail aboard the 44-passenger Harmony G along the coast of West Africa and up the Gambia River.