Green Tree Frog

Green Tree Frogs are native to northern and eastern Australia, with a natural range extending from the Kimberley region of Western Australia across the Northern Territory and throughout Queensland and into New South Wales. They inhabit tropical and subtropical forests, woodlands, wetlands and areas near permanent water sources. Highly adaptable, they are regularly found in suburban gardens, downpipes, outdoor toilets and sheds — earning them the affectionate nickname 'dunny frog' across northern Australia.

They are nocturnal, emerging after dark to hunt for insects near light sources, and shelter in cool, moist spots during the day. In the wild, they experience warm, humid summers and drier, cooler winters — seasonal variation that influences breeding behaviour in captivity. Their ability to tolerate a wide range of conditions makes them one of Australia's most resilient frog species, and one of the best suited to captive life.

Green Tree Frogs are arboreal — they spend the majority of their time off the ground — so height is the most important dimension of their enclosure. A minimum enclosure size for a single adult is 60 cm W × 45 cm D × 60 cm H; for two to three individuals, 60 × 45 × 90 cm is recommended. Front-opening enclosures are strongly preferred, as approaching from above mimics a predator and causes unnecessary stress.

Ventilation is critical — stagnant, poorly circulated air leads to bacterial growth and respiratory disease. Mesh panels or screen tops should provide adequate airflow without excessive moisture loss. Substrate should retain humidity without becoming waterlogged; coconut fibre, sphagnum moss, or a bioactive mix of soil and leaf litter are all suitable options.

Provide multiple cork bark hides, a variety of live or artificial tropical plants (pothos and bromeliads are ideal), and sturdy climbing branches at different heights to encourage natural behaviour. Maintain daytime temperatures of 28–31°C with a gentle drop to 20–24°C at night, regulated in cooler climates by a low-wattage ceramic heat emitter on a thermostat. Humidity should be maintained at 50–70% during the day, rising to 80–90% at night; mist the enclosure once or twice daily using dechlorinated water. A shallow water dish — refreshed daily — completes the setup. Low-output UVB lighting (T5 6% or equivalent) is increasingly recommended and supports long-term health.

Green Tree Frogs are insectivores and require a diet of live prey items to stimulate natural feeding behaviour. Crickets and wood cockroaches (woodies) form the staple diet, supplemented with black soldier fly larvae, silkworms and, occasionally, waxworms or mealworms as high-value treats. Waxworms and mealworms are high in fat and should be offered only sparingly.

All feeder insects must be gut-loaded for at least 24–48 hours before being offered, to maximise nutritional value. Dust insects with a quality calcium supplement at every feeding, and with a combined multivitamin supplement every two to three feedings. Juveniles should be fed daily; adults every two to three days. Prey size should be no larger than the width of the frog's head.

Fresh, dechlorinated or filtered water must always be available in a shallow, escape-proof dish large enough for the frog to soak in. Remove uneaten insects promptly to reduce stress and prevent injury to the frog.

Calm and generally tolerant of a well-maintained environment. Green Tree Frogs are not aggressive and rarely attempt to bite. Handling should be kept to a minimum and always brief — no more than five to ten minutes at a time. Always wet hands thoroughly with clean, dechlorinated water before any contact, as dry hands and chemical residues can harm the frog's sensitive skin. Avoid handling during shedding, in the 24 hours following feeding, or if the frog is showing signs of stress such as darkened colouration or frantic movement.

Green Tree Frogs should not be housed with other frog species. Two or more animals of similar size can generally cohabitate, but feeding should be monitored closely to prevent competition.

Green Tree Frogs benefit most from a naturalistic, complex enclosure rather than direct interaction. Live or silk plants at multiple heights encourage climbing and provide resting spots that mimic natural foliage. Cork tubes, hollow branches and bark hides give the frog choice in where it rests and shelters. Rearranging the enclosure layout during cleans provides novelty and encourages exploration.

A small, safe drip system or gentle waterfall feature adds sensory stimulation and helps maintain ambient humidity. Offering variety in feeder insect species — crickets, woodies, silkworms, black soldier fly larvae — provides nutritional enrichment and encourages natural hunting behaviour. Placing the enclosure in a quiet room where the frog can detect household movement from a safe distance, without direct disturbance, also supports natural alertness.

Chytridiomycosis (chytrid fungus) is one of the most serious diseases affecting frogs worldwide, causing skin deterioration and potentially death. It is best prevented by sourcing only captive-bred animals from reputable, licensed breeders and maintaining strict hygiene practices. Red-leg syndrome is a bacterial infection causing redness on the limbs and abdomen, typically linked to poor water quality or chronic stress — improve husbandry and seek veterinary treatment promptly.

Nutritional deficiencies, including metabolic bone disease, can result from inadequate calcium supplementation or poorly gut-loaded feeder insects — prevent with correct supplementation and a varied diet. Incomplete shedding (dysecdysis) is usually caused by insufficient humidity — maintain correct misting schedules and provide a humid hide if needed. Obesity is a common issue in captive frogs; monitor body condition and limit high-fat food items. Any signs of lethargy, weight loss, skin lesions or behaviour changes warrant prompt assessment by a reptile-experienced veterinarian.