Green Tree Python (Morelia viridis): A Straight-Talk Care & Buyer’s Guide

When most reptile keepers say “tree python,” they are talking about the Green Tree Python, often called a chondro. Few snakes in the hobby have the same instant visual impact. A settled adult draped over a perch looks unreal, almost too perfect to be alive. That is also why so many people buy them for the wrong reason. They see the color, the pose, and the photos, but they do not realize this is a species that does best with precision, patience, and restraint.

Green tree pythons are not impossible to keep, but they are not forgiving when care is sloppy. They need sensible temperatures, steady hydration, excellent airflow, smart feeding, and a keeper who does not feel the need to handle them every other day. This guide covers what they are really like in captivity, the locality types you will hear about, common pet-store animals versus higher-end boutique stock, typical price ranges, feeding, temperament, enclosure design, humidity, and the mistakes that trip up new keepers most often.

Quick Facts (know the animal in two minutes)

Common name: Green Tree Python
Scientific name: Morelia viridis
Nickname in the hobby: Chondro
Native range: New Guinea, nearby Indonesian islands, and part of Cape York in northern Australia
Lifestyle: Arboreal ambush predator that spends most of its time perched above the ground
Look: Bright green adults with white, yellow, or blue markings, plus yellow or red neonates that change color as they mature
Adult size: Usually about 4-6 ft, with females typically heavier and some locality types getting larger
Temperament: Alert, perch-oriented, often food responsive, and usually more of a display snake than a handling snake
Lifespan: Often 15-20+ years with solid husbandry
Experience level: Intermediate to advanced

Localities, Lineage, and Why Names Matter

With green tree pythons, keepers usually talk about localities rather than formal subspecies. In practical terms, locality is what matters in the pet trade. It shapes expectations around adult look, average build, temperament reputation, neonate color, and sometimes price. That said, appearance alone does not prove a snake is locality-pure. Plenty of animals in the hobby are mixed, and some labels are used loosely.

Aru: A well-known southern island type, often appreciated for a stockier look, attractive high-white potential, and a reputation for being one of the steadier locality types.
Biak: Usually one of the larger and longer-tailed types. Biaks are famous for strong feeding response, bold looks, and a reputation for being more reactive than average.
Sorong: A very popular locality name in the hobby, often associated with nice blues, clean greens, and a manageable size. A lot of keepers consider Sorong-type animals a practical entry point.
Jayapura: Often sought for bright color, attractive adult development, and eye-catching neonate tones. Good Jayapura animals can be especially clean-looking.
Merauke: A southern mainland type that often trends larger, with longer bodies and nice striping in some animals.
Wamena, Cyclops, Manokwari, and other locality lines: These can be prized for darker tones, blue influence, striping, or simply because a breeder has worked the line carefully for years.

Important reality check: locality names are helpful, but they are not magic. Some sellers are very exact about lineage and some are not. In green tree pythons, breeder honesty matters a lot. A clean mixed-locality captive-bred animal can still be excellent. It just should not be sold as something it is not.

Behavior & Temperament (what they are really like)

Green tree pythons are one of the purest display snakes in the hobby. They are not hyperactive, they do not cruise the enclosure all day, and they do not usually want regular casual handling. They spend most of their time perched, resting, and waiting. Once the room settles down and the lights go low, they become more aware of movement and far more likely to reposition.

Daily rhythm: Most adults stay tucked on a perch during the day, then become more alert in the evening and overnight.
Feeding response: Many are very keyed in to food cues. A chondro that looks calm can turn serious the second it thinks a rodent is coming.
Handling: They tolerate necessary handling better when it is short, calm, and purposeful. They are not the species to pass around the room.
Babies can be sharper: Neonates and juveniles are often more defensive than settled adults.
Locality reputation matters, but only to a point: Biaks often carry the strongest reputation for attitude, while Aru, Sorong, and some Jayapura lines are often described as easier. Still, individual temperament always wins.
Stress signs: Constant daytime roaming, repeated striking, nose rubbing, sitting directly under heat all day, or never relaxing on a perch can signal a husbandry problem.

A good green tree python should look composed, perched well, and comfortable being left alone. If the animal seems edgy around the clock, do not assume that is just “how chondros are.” Sometimes it is the enclosure telling on you.

Pet Store “Chondros” vs Boutique-Bred Green Tree Pythons

This is one of the biggest dividing lines in the hobby. A lot of general reptile stores and mass-market online sellers offer green tree pythons that are imported, farm-bred, or loosely labeled mixed-locality animals. They can look appealing because the entry price is lower, but the lower upfront cost is often where the easy part ends.

Pet-store or import-type animals: More likely to arrive dehydrated, parasite-loaded, lightly established, or mislabeled. Some do fine, but many need extra work, extra quarantine, and extra luck.
Boutique breeder animals: Usually captive-bred, better documented, more consistently feeding, and more honestly represented. Higher purchase price, but often much lower risk.
What you are really paying for: Feeding history, solid early hydration, proper setup from day one, verified lineage where possible, and a breeder who actually knows the parents.

If this is your first green tree python, a well-started captive-bred animal from a breeder who knows the line is almost always the smarter move. This is not a species where buying the cheap one usually saves money.

Price Ranges (what the market usually looks like)

Prices move around based on the seller, locality, lineage, and how the current market looks, but this is a realistic way to think about it:

Imported, farm-bred, or rough mixed-locality animals:
- Usually around $400-$900
Captive-bred mixed-locality or more common locality-type animals:
- Often around $900-$1,800
Well-started locality animals from established breeders:
- Commonly $1,500-$3,000+
Designer, line-bred, or premium selective animals:
- Often $2,500-$6,000+, sometimes higher for standout animals or proven adults

Green tree pythons are not like ball pythons where there is a huge catalog of standardized morph combinations. High-end pricing here usually comes from locality, purity, blue influence, high yellow, dorsal pattern, neonate color, adult development, and breeder reputation, not from stacking a dozen named genes.

How Big Do Green Tree Pythons Get?

Typical adult males: Often around 4-5 ft, usually more slender than females
Typical adult females: Often around 4.5-6 ft, with noticeably more body mass
Larger locality types: Biak, Merauke, and some Aru lines can trend bigger and heavier
Overall build: They are not massive like boas, but they are muscular, strong, and built to grip a perch securely

Do not rush growth just to make a young snake look impressive. Green tree pythons do better when grown steadily. Overfeeding shows up fast in this species, especially in the tail base and overall body shape.

Diet & Feeding (where many keepers go wrong)

What to feed

Primary diet: Frozen-thawed mice and rats sized appropriately to the snake
Neonates and small juveniles: Usually start on pinks, fuzzies, or small hoppers depending on size and how they were established
Older juveniles and adults: Typically graduate to hopper mice, adult mice, rat pups, and modest small rats over time
Optional variety: Some keepers rotate in chicks or quail, but it is not necessary if the snake feeds well on rodents

How much

Prey should generally be no wider than the thickest part of the snake, and in many cases slightly smaller is better.
A mature green tree python usually does better on a modest meal schedule than on oversized prey.
If you are trying to choose between two prey sizes, the smaller option is often the smarter one.

How often

Freshly established babies: every 5-7 days
Older juveniles: every 7-10 days
Subadults: every 10-14 days
Adults: every 14-21 days, with some mature animals doing well on longer spacing

Why regurgitation becomes a problem

Green tree pythons have a reputation for regurgitation, but most of the time it is not random. It usually comes from one or more husbandry errors stacking up together:

Too much heat: Especially when the whole enclosure is kept too warm instead of offering a moderate warm perch and cooler surrounding air
Too large a meal: Big meals are hard on them, especially if the animal is young or newly acquired
Too much handling after feeding: Leave them alone for at least 48-72 hours after meals
Wet, stagnant air: High humidity without airflow causes more trouble than slightly lower humidity with good fresh air

If a green tree python regurgitates, do not rush right back into feeding. Let the animal settle, review the setup honestly, then restart with a very small meal after an appropriate pause.

Temperatures, Humidity, and Lighting (the numbers that actually matter)

Daytime ambient: 78-82°F
Warm perch area: 84-86°F
Cool zone: about 75-77°F
Night drop: around 72-75°F
Humidity: generally 55-75%, with temporary increases during shed cycles and a chance to dry out between mistings

The most common mistake with chondros is treating them like they need a hot, swampy box. They do not. They need airflow, moderation, and rhythm. A cage that stays soaked and stuffy is a problem even if the humidity number looks good on paper.

Heating: A radiant heat panel or guarded overhead heat source on a reliable thermostat works well. Focus on the perch temperature, not just the floor or the general room temperature.

Lighting: A normal day-night cycle is useful. Bright full-spectrum lighting helps the enclosure look better and can support a more natural rhythm. Low-output UVB is optional, not mandatory.

Enclosure & Habitat: Build the enclosure around the perch, not the floor

Adult enclosure size

Typical adult male: A well-furnished 36″ W x 24″ D x 24″ H can work, though more height is welcome
Large female or high-end display setup: 48″ W x 24″ D x 36″ H or similar is better
Babies and juveniles: Smaller secure setups are often easier at first, but well-started youngsters can do well in larger cages if there is enough cover and perch choice

Perches

Main perch size: Usually about the same diameter as the snake’s body, or slightly larger
Number of perches: At least 2-3 horizontal perches at different heights
Placement: One should sit in the warmer zone, one in the cooler shaded zone, and one can serve as a mid-level travel perch
Material: Sealed natural wood, smooth branches, or textured PVC all work if they are sturdy and easy to clean
Removable setups help: Being able to lift a perch out with the snake still on it makes cleaning and weighing much easier

Visual security

Use foliage, cork panels, and side cover to let the snake feel hidden without eliminating airflow.
A completely exposed perch in a bright cage often creates a nervous snake.
Green tree pythons do best when they can choose between being visible and tucked away.

Water & hydration

A clean water bowl on the floor should always be available.
Many green tree pythons also drink from water droplets after a light mist or dripper session.
Consistent hydration matters more than dramatic daily soaking.

Substrate

Paper or butcher paper: Clean, simple, and easy to monitor
Coco chips or orchid bark: Good for humidity control if you keep airflow up and spot-clean well
Bioactive: Possible, but not the easiest route for a first chondro because balance is everything with this species

Ventilation

Cross-ventilation is one of the best things you can give a green tree python.
If the glass is constantly dripping with condensation, the cage is probably too stagnant.
Fresh air is a big part of respiratory health with arboreal pythons.

Shedding & Humidity Management

Normal target: Keep humidity in a healthy range, but let the cage dry somewhat between heavy moisture events.
Before a shed: Increase hydration slightly through light misting, a dripper, or a slightly damper micro-zone.
Bad sheds usually mean: The snake is too dry overall, too dehydrated internally, or the cage is not balancing humidity and airflow well.
Avoid overcorrecting: Turning the entire enclosure into a wet box is not the answer.

A clean full shed usually reflects a well-hydrated snake and a cage that is being run correctly over time, not just on shed week.

Handling & Safety (for you and the snake)

Use a hook or spare perch: This helps lift the snake cleanly and avoids confusing feeding mode with handling time.
Keep it short: Most green tree pythons do better with brief, necessary handling rather than long handling sessions.
Support the body: Never peel a tightly wrapped chondro off a perch roughly.
After feeding: Do not handle for at least 48-72 hours.
Children and guests: This is a look, do not touch kind of snake unless the animal is being moved by someone who knows what they are doing.

Health Issues to Watch Early

Common issues in captivity include:

Dehydration: Wrinkled skin, poor sheds, tacky mouth, and a snake that looks drawn out instead of smooth and settled
Regurgitation: Usually tied to heat, prey size, stress, or poor timing
Respiratory problems: Open-mouth breathing, wheezing, excess saliva, or repeated gaping should be taken seriously
Parasites: A major concern with imported animals, which is why quarantine matters so much
Mouth issues: Swelling, redness, foul odor, or stringy saliva can signal a problem that needs veterinary attention
Nose rub and stress wear: Often a clue that the cage is too exposed, too hot, or just not comfortable for the animal

Quarantine: Keep any new green tree python separate for at least 90-120 days with separate tools, separate cleaning routine, and ideally a reptile vet check if there is any question about origin or condition.

Locality Differences That Matter in Captivity

Biak: Often larger, longer-tailed, and more reactive. Gorgeous animals, but not always the easiest first experience.
Aru: Often heavier-bodied southern-type animals, sometimes regarded as more even-tempered, with excellent white and blue potential.
Sorong and Jayapura: Commonly favored by keepers who want strong looks without chasing the largest or sharpest-reputation locality types.
Merauke: Often appreciated for size, length, and southern-type influence.
Wamena, Cyclops, Manokwari, and other premium lines: Usually chosen for very specific visual goals, like darker tones, blue, striping, or a breeder’s long-term project vision.

Just remember, locality trends are tendencies, not promises. A calm Biak exists. A defensive Aru exists. Buy the individual and the breeder, not just the label.

Breeding (high-level only)

Maturity: Males are often ready earlier, while females need more time and more body condition. Think in terms of size and stability, not just age.
Reproduction type: Green tree pythons are egg-layers, not live-bearers.
Typical clutch size: Often around 10-20+ eggs depending on the female
Hatch timing: Eggs usually hatch in roughly 50 days when incubated properly
Breeding ethics: If locality and lineage are part of the value, they need to be tracked and represented honestly.

Daily/Weekly/Monthly Care Plan (simple and repeatable)

Daily

Check posture, breathing, and overall calmness on the perch
Confirm temperatures and humidity
Refresh water if needed

2-3 times per week

Run a light mist or short dripper session if the room is dry
Spot-clean waste and wipe down dirty perches or glass
Make sure the animal is still using the enclosure naturally and not avoiding a certain zone

Feeding

Babies: every 5-7 days
Juveniles: every 7-10 days
Subadults: every 10-14 days
Adults: every 14-21 days, sometimes longer

Monthly

Disinfect perches, cage walls, and high-touch areas
Replace substrate as needed
Weigh the snake and keep a record of body condition, sheds, and feeding response

Quarterly

Do a full enclosure reset if the setup is not bioactive
Review your records and adjust feeding or hydration if the snake is drifting too heavy, too dry, or too stressed

Common New-Keeper Mistakes (and how to avoid them)

Keeping them too hot.
- Fix: Think moderate perch warmth, not tropical oven. A warm perch is enough. The whole cage does not need to be hot.
Keeping them too wet with poor airflow.
- Fix: Aim for controlled humidity and fresh air, not a soaked cage.
Feeding like they are boas.
- Fix: Use smaller prey and more restraint. Green tree pythons do not need heavy meals to look healthy.
Buying the cheapest one they can find.
- Fix: Spend the money on a well-started captive-bred animal instead of gambling on an import.
Handling too much.
- Fix: Let the snake be what it is, a perch-oriented display python.
Using bad perches and too little cover.
- Fix: Build the cage around proper perch diameter, stability, and visual security.
Trusting labels too easily.
- Fix: Ask what is documented, what is mixed, and what is just being sold by appearance.

Is a Green Tree Python Right for You?

A green tree python is a good fit if you want:

A true display snake that looks incredible even when it is doing absolutely nothing
A species that rewards careful setup and routine
A higher-end arboreal python with real collector appeal
A reptile that does not need constant interaction to be enjoyable

Think twice if you want:

A snake you can handle often
A cheap entry into arboreal pythons
A very forgiving species that can shrug off sloppy cage conditions
An animal you can buy on looks alone and figure out later

Green tree pythons are amazing for the right keeper. They are usually a bad fit for the person who wants to do everything by feel and fix problems after they happen.

Practical Buying Tips (before you spend the money)

Ask if the animal is captive-bred, farm-bred, or imported. This matters a lot.
Ask for feeding records. You want a snake that is eating steadily and has been doing so for a while.
Ask what the locality claim actually means. Documented lineage and visual type are not the same thing.
Look at body shape. The snake should look smooth, hydrated, and evenly muscled, not pinched or bloated.
Look at how it perches. A settled animal usually looks confident and composed on the perch, not frantic.
Inspect the mouth and nose if possible. No bubbles, no excess saliva, no swollen gum line, no constant rubbing.
Budget for quarantine and possible vet work. Especially if the animal is not from a proven captive-bred source.

Example Enclosure Map (for a typical adult green tree python)

Enclosure: PVC cage, roughly 36″ W x 24″ D x 24-36″ H depending on the size of the animal
Heat: Radiant heat panel on thermostat mounted overhead toward the rear or one side
Main warm perch: Mid-upper level, not directly pressed against the heat source
Cool perch: Opposite side, partially screened by foliage
Third perch: Mid-level travel perch for nighttime movement
Water: Floor bowl large enough for steady access, with optional dripper use when needed
Substrate: Paper, coco chip, or orchid bark depending on your cleaning style
Cover: Side clutter, back cover, and foliage around at least one preferred perch
Monitoring: Digital probes for warm and cool zones, plus a reliable hygrometer

FAQ (fast answers to the questions people always ask)

Do green tree pythons need UVB?
No, not as a requirement. A solid day-night light cycle is more important. Low-output UVB can be used if the enclosure provides shade and choice.

Are Biaks always mean?
No. They simply have a stronger reputation for being reactive. Individual temperament still matters more than the label.

Can I keep two together?
No. House them individually. This is not a species that benefits from cohabitation.

Should I mist the cage every day?
Not automatically. The goal is hydration plus airflow. Some setups need regular light misting, others do not.

Can a baby go into a large adult cage?
Yes, if the enclosure is furnished well, offers security, and the baby is established. A huge empty cage is the problem, not just the size itself.

Are green tree pythons beginner snakes?
No. They are better for keepers who already understand feeding restraint, temperature control, hydration, and quarantine.

The Bottom Line

Green tree pythons earn their reputation because they combine extreme beauty with a fairly narrow margin for error. They are not delicate ornaments, but they are a species that clearly tells you whether your husbandry is thoughtful or sloppy. When the setup is right, they perch hard, feed steadily, shed cleanly, and become one of the most satisfying snakes in the room.

At Majestic Reptiles, we see green tree pythons as a species for keepers who care about detail. If you want help choosing between locality types, avoiding common beginner mistakes, or deciding whether you are better off with a captive-bred mixed-locality animal or a premium locality project, that conversation matters just as much as the snake itself.