Green with dampness. Red is the most active color, blue the most passive; green, in the middle, is the color of neutrality and calm, sometimes used in architecture and design for these reasons. Blue and green together symbolize harmony and balance. Green is often associated with jealousy and envy. The expression "green-eyed monster" was first used by William Shakespeare in Othello: "it is the green-eyed monster which doth mock the meat it feeds on." Shakespeare also used it in the Merchant of Venice, speaking of "green-eyed jealousy." Green today is not commonly associated in Europe and the United States with love
Green-eyed tree frog only be heard from short distances. Oftentimes the male's mating call can sound like a quiet tapping noise. Being semi-aquatic, green-eyed tree frogs call from vegetation in water and have two types of calls: harsh trill and untrilled. Some males choose to call in groups of a hundred or more and can be found harmonizing at night. During these mating calls, the males are typically located in vegetation in water. Breeding season occurs during May and July, corresponding with the early rain season, though it has been reported that breeding might occur year-round. Breeding season in Australia starts in August.