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Adults vary in size with males ranging from 53-56 mm and females ranging from 60-66 mm. Males are more brightly colored, though both sexes display diurnal color variation. At night, the frogs are a dark green while during the day they turn an emerald green with two iridescent copper bands. An uneven yellow coloration has also been reported on the male vocal sac. The eyes have a vertical, elliptical pupil. Tadpoles of Hylorina sylvatica are light brown on top and dark brown below. They can be further distinguished by a dark ring around the nostrils and a rhomboidal spot between the eyes.