Litoria caerulea

The green tree frog is a plump, rather large tree frog, and can grow up to 11.5 cm (4.5 in) in length, with fully grown females being slightly larger than males. A distinctive fatty ridge is seen over the eye, and the parotoid gland is moderately large. The iris is golden and has a horizontally slit pupil, as is typical of the genus Litoria, and the tympanum (a skin membrane similar to an eardrum) is visible just behind the eye. The limbs are short and robust, and large adhesive discs are at the end of the digits which provide grip while climbing. The fingers are about one-third webbed, and the toes nearly three-quarters webbed. The dorsal color depends on the temperature and nature of the environment, ranging from brownish- or greyish-green to bright emerald green. The frog occasionally has small, irregularly shaped white spots on its back. Males have a greyish, wrinkled vocal sac under the throat, while the throat of females is white. The ventral surface in both sexes is creamy-white and rough in texture. This frog is similar in appearance to the magnificent tree frog (L. splendida), which inhabits only north-western Australia. Older members of that species have very large parotoid glands, which cover the entire top of their heads and droop over their tympana. The parotoid gland of the green tree frog is much smaller, and it also lacks the yellow speckling on the back and the yellow markings on the hand, groin, and thigh. It can be distinguished from the white-lipped tree frog(giant tree frog L. infrafrenata) by the distinct white stripe that species has along the edge of the lower jaw and extending to the shoulder, which is not present in the green tree frog. The tadpoles' appearance changes throughout their development. When newly hatched, they are 8 mm (0.3 in) long and when fully developed, 44 mm (1.7 in). They are initially mottled with brown, and increase in pigmentation (to either green or brown) during development. Their undersides are initially dark, but later become lighter in hue. The eggs are brown and are wrapped in a clear jelly; they are 1.1 to 1.4 mm (0.043 to 0.055 in) in diameter. The call is a low, slow brawk-brawk-brawk, repeated many times. For most of the year, the frogs call from high positions, such as trees and gutters, but during the breeding season, they descend to near the ponds and pools, where they breed. Like many frogs, green tree frogs call not only to attract a mate, but also to advertise their location outside the mating season. They are particularly vocal after rain, but the reasons for this are unclear. They emit a stress call when they are in danger, such as when being attacked by a predator or when a person steps on the log in which one is concealed.