Red-eyed treefrog (Agalychnis callidryas) Costa Rica.

This is the iconic Costa Rican red-eyed tree frog (Agalychnis callidryas). I shot this picture at La Selva Biological Station where they are easy to find during rainy season and far less common the rest of the year. These frogs are extremely good climbers and I've seen them shimmy up a branches like trapeze artists. They can stretch their legs out far behind their bodies and use their arms to pull themselves onto branches.