Snake Species · New Guinea, Indonesia, Australia
Green Tree Python
Emerald coil over rainforest branches — heavily collected for the pet trade.
By the WARN Research & Conservation TeamChecked against IUCN Red List & CITES sourcesLast updated
In brief
The Green Tree Python is an emerald arboreal python from New Guinea, Indonesia and Cape York — hatching yellow or red before turning green with age. Its defining trait is striking colour ontogeny and coil-over-branch resting posture. Wild collection for export remains a conservation concern despite captive breeding success in Malaysia and Indonesia.
Green Tree Python: At a Glance
| Origin | New Guinea, Indonesia, Australia |
|---|---|
| Size | Medium (1.5–2 m) |
| Typical length | 1.5–2 m (5–6.5 ft) typical; slender arboreal build weighing 1–2 kg |
| Lifespan | 10–30 years depending on species |
| Scales & pattern | Adults vivid emerald green with white or yellow scattered scales; some populations show blue highlights. Juveniles hatch yellow, red or maroon before ontogenetic colour change at 12–24 months. Smooth scales with white speckling. Coil draped over branches in characteristic saddle posture — never pull a coiled green tree python from a perch. |
| Temperament | Arboreal, striking from branches |
| Conservation note | Expert arboreal snake keepers only — green tree pythons are sensitive to handling stress, thermal burns and incorrect humidity. Vertical enclosures with perches at multiple heights are essential. Captive-bred from established lines preferred over wild-imported specimens. |
History & Origins
Green tree pythons inhabit lowland and montane rainforest of New Guinea, surrounding islands, eastern Indonesia and Cape York Peninsula, Australia. They were historically confused with the unrelated emerald tree boa of South America due to convergent green colouration and arboreal habit. Wild collection for the pet trade from Indonesia and Papua New Guinea peaked in the 1980s and 1990s. Captive breeding programmes in Europe, North America and Malaysia now supply most pet green tree pythons. Ontogenetic colour change from juvenile red or yellow to adult green is among the most dramatic in snakes. Locality-specific forms — Biak, Aru, Manokwari — show variation in size, colour and temperament. CITES Appendix II listing applies to international trade.
Green Tree Python Fun Facts
- Green tree pythons hatch yellow or red and turn green with age — one of the most dramatic colour changes in snakes.
- They rest coiled over branches in a saddle posture unique among pythons.
- Convergent evolution produced similar green colour in the unrelated emerald tree boa of South America.
- Biak locality green tree pythons show larger size and more aggressive temperament than Aru forms.
Green Tree Python Common Health Issues
Conditions seen more often in this breed, and how owners and vets help manage them. This is general guidance, not veterinary advice — always speak to your vet.
Stress in improper captivity
Excessive handling, incorrect perch setup and visible open spaces cause chronic stress, refusal to feed and defensive striking in green tree pythons.
Care: Provide visual security, appropriate perches and minimal handling. Allow acclimatisation weeks after arrival before any interaction.
Illegal wild harvest
Wild green tree pythons are collected from Indonesia and Papua New Guinea for export despite captive breeding availability.
Care: Purchase captive-bred animals only. Support conservation of New Guinea rainforest habitat.
Thermal burns from heat lamps
Arboreal pythons resting close to unguarded heat lamps suffer burns on dorsal scales — common in improperly set up enclosures.
Care: Use thermostats and guard heat sources. Position perches so snakes cannot contact bare bulbs or ceramic emitters.
Snakes keep ecosystems healthy
Snakes control rodents and serve as prey for raptors — yet persecution and habitat loss remove them silently. WARN publishes these guides to reduce fear-driven killing in Pakistan, Brazil, Colombia and beyond.
