Five-day-old red-eyed treefrog embryos are tightly curled inside dehydrated eggs packed closely together. It’s dry enough to make them begin to hatch early amid heating. Karen M. Warkentin As the frog ...

A new study from the Smithsonian Tropical Research Institute (STRI) shows that red-eyed treefrog embryos hatch early when exposed to high ammonia levels — an environmental cue that it’s too hot and ...

Boston University undergraduate Jessica Rogge and associate professor Karen Warkentin, working at the Smithsonian Tropical Research Institute's laboratories in Gamboa, Panama, discovered that frog ...

This video shows a close-up view of a colorful red-eyed tree frog resting on a moss-covered branch in the tropical rainforest of Costa Rica. The frog has bright green skin, striking red eyes, and ...

This infrared video recording shows a parrot snake (Leptophis ahaetulla) attacking a red-eyed treefrog (Agalychnis calidryas) egg clutch. Some of the treefrog embryos escape the snake by hatching ...

The red-eyed tree frog has become one of Costa Rica’s most iconic creatures, admired for its vibrant colors and widespread presence across the country. This frog, known for its striking red eyes, ...