This little fella is a Agalychnis callidryas - also called red-eye tree frog from/in Costa Rica. It is not very impressive if you find one sleeping at a leaf but if it gets up it looks just amazing. Best time to find one active is at night but sometimes you get lucky, and you see one changing its spot during the day. The shot was taking with a 100mm Macro lens with a full frame camera. As the frog was quite fast I could not use a mono- or tripod.