Polka-Dot Tree Frog, Madidi National Park, BoliviaA month from today, I’ll finally be back to my international wildlife travels for the first time since before Covid. It’ll just be for a week, but I’ve chosen the Peruvian Amazon. I’ve always loved the Amazon for all it’s varied life both night and day, including the nocturnal tree frogs. This image was taken years ago in the Bolivian Amazon. It’s a polka-dot tree frog. Interesting note about these guys. In 2017, scientists discovered — quite by accident — that their skin is naturally fluorescent. They were studying a frog for other reasons and put it under ultraviolet light. That was only five years ago, but biologists now know that quite a few species of frogs exhibit a natural, bright green fluorescent glow when exposed to UV light. It’s thought that the fluorescence plays a role in communication, camouflage and mating. Nikon D300 with Nikkor 200-400mm lens (at 400mm) ISO 200, f/5.6 at 1/60th of a second, two Nikon SB-600 flash units.