Red-eyed tree frogs, as their name states, have red eyes with vertically narrowed noses, a vibrant green body with yellow and blue vertically striped sides, and orange or yellow webbed feet and toes. There is a great deal of regional variation in flank and thigh coloration. Although it has been suggested that A. callidryas’ bright colors function as aposematic or signals, neither of these hypotheses have been confirmed. Males range from 2 (5.08 centimetres) to 2½ inches (6.35 centimetres), while female range from 2½ (6.35 centimetres) to 3 inches (7.62 centimetres) on average. Young frogs are typically brown in color and turn greener as they mature, although adult frogs can change their color slightly depending on mood and environment. Red-eyed tree frogs have soft, fragile skin on their stomach, and the skin on their back is thicker and rougher.