This guy is one of the many species of glass frog that can be found in the tropical rain forests of Central and South America. This particular species of the emerald glass frog is native to Ecuador. They are called glass frogs because the skin on their underside is translucent and you can see straight through to their inner organs, including the heart, liver and gastrointestinal tract. Obviously, I wasn’t going to flip the little guy over, but you can sort of see the translucent skin on the second of the three shots down where the torso meets the leg.
Nikon D800 camera with Nikkor 105mm f/2.8 lens, ISO 200, f/10 (first shot), f/14 (second and third shots), 1/60th of a second with two SB-R200 wireless flash heads attached to the front of the lens