Amethystine / Scrub Python (Simalia amethistina) Care Sheet
The Amethystine Python, commonly known as the Scrub Python, is a very large, powerful and highly active python native to New Guinea and surrounding islands. It is named for the remarkable amethyst-like iridescence visible across its scales under suitable lighting.
Scrub Pythons are long, athletic and extremely capable climbers. Unlike heavier-bodied giant pythons, they combine considerable adult size with speed, agility and a strong feeding response. These characteristics make them demanding animals to house and manage safely.
They require exceptionally spacious, secure and environmentally complex accommodation and should be regarded as an advanced species, particularly once adult size is reached.
Quick Facts
Scientific name: Simalia amethistina
Common names: Amethystine Python / Scrub Python
Family: Pythonidae
Origin: New Guinea and surrounding islands
Adult size: Commonly approximately 300–450 cm (10–15 ft), with exceptionally large individuals reported
Lifespan: Approximately 20+ years with appropriate care
Activity: Primarily crepuscular and nocturnal, although activity may occur throughout the day
Lifestyle: Terrestrial to semi-arboreal
Diet: Carnivorous
Reproduction: Egg-laying
Temperament: Alert, fast and highly food-responsive; individuals vary
Experience level: Advanced
Taxonomy
The Amethystine Python is currently recognised as:
Simalia amethistina
It was historically placed within the genus Morelia and may therefore appear in older literature as:
Morelia amethistina
The wider amethystine python group contains several closely related geographically distinct species.
Accurate identification and locality information are therefore important, particularly for breeding animals.
Distribution
Simalia amethistina is associated primarily with New Guinea and nearby islands.
The broader group of snakes historically referred to as “amethystine pythons” occurs across a wider region.
For captive animals, keepers should therefore establish where possible:
- Species identity
- Geographic origin
- Parentage
- Lineage
The generic name “scrub python” should not automatically be assumed to identify every animal to species level.
Natural Habitat
Amethystine Pythons inhabit warm environments that can include:
- Tropical rainforest
- Forest margins
- Woodland
- Riverine vegetation
- Dense scrub
- Areas near human habitation
They make extensive use of both terrestrial and elevated environments.
Their natural habitat provides considerable structural complexity, something that should be reflected in captive accommodation.
Appearance
Amethystine Pythons are usually relatively slender for their considerable length.
Colouration may include:
- Brown
- Olive
- Tan
- Gold
- Grey
- Dark brown
Their scales can produce spectacular iridescence displaying:
- Purple
- Blue
- Green
- Bronze
- Rainbow-like tones
This iridescence is responsible for the name “amethystine”.
Adult Size
Scrub Pythons are among the world’s longest snakes.
Adults commonly reach approximately:
300–450 cm (10–15 ft)
although individual size varies substantially.
Exceptionally large animals have been reported beyond these typical captive dimensions.
Adult females can become particularly large.
Prospective owners should plan for the animal’s adult size before acquiring a juvenile.
Body Form
Unlike the extremely heavy build of some giant pythons, Scrub Pythons are generally:
- Long
- Muscular
- Athletic
- Agile
- Powerful climbers
Their relatively slender appearance can cause inexperienced keepers to underestimate their strength.
A large adult is capable of rapid movement and has considerable reach.
Enclosure
Adult Scrub Pythons require exceptionally spacious accommodation.
For an average adult, approximately:
300 × 150 × 180 cm (10 × 5 × 6 ft)
should be regarded as a practical minimum starting point rather than an ideal maximum.
Large individuals may require considerably more space.
Where possible, dedicated room-sized or walk-in accommodation can provide substantially better opportunities for natural movement.
Enclosure Design
An adult enclosure should provide:
- Extensive floor space
- Significant usable height
- Heavy-duty climbing structures
- Elevated platforms
- Multiple secure retreats
- Large water container
- Broad thermal gradient
- Environmental enrichment
The snake should be able to:
- Stretch extensively
- Climb
- Explore
- Select different temperatures
- Conceal itself
- Rest above ground
Juvenile Enclosures
Juveniles can initially be maintained in smaller secure accommodation.
Provide:
- Multiple hides
- Elevated retreats
- Climbing branches
- Fresh water
- Appropriate substrate
- Dense environmental cover
- Thermal gradient
Juveniles may be nervous and defensive when excessively exposed.
Accommodation must be enlarged progressively as the snake grows.
Growth can be considerable, so adult housing should be planned well in advance.
Enclosure Security
Scrub Pythons are strong, intelligent and persistent.
Adult enclosures require:
- Heavy-duty doors
- Reliable locks
- Strong hinges
- Secure ventilation panels
- Protected cable openings
- Robust fixtures
Sliding doors should be securely locked.
A large python can exert substantial force against enclosure fittings.
Never rely upon enclosure weight alone to keep a large snake contained.
Climbing Opportunities
Climbing is an important part of Scrub Python behaviour.
Provide:
- Heavy branches
- Logs
- Horizontal beams
- Elevated shelves
- Platforms
All structures must safely support the entire weight of the snake.
Fixtures should be designed so that routine cleaning and maintenance remain possible without compromising safety.
Elevated Resting Areas
Large elevated platforms can be particularly valuable.
They provide:
- Resting positions
- Observation points
- Basking opportunities
- Additional thermal zones
The snake should be able to rest securely without constantly balancing on narrow branches.
A mixture of branches and broad platforms works well.
Hides
Large snakes still require secure hiding opportunities.
Provide retreats in different areas of the enclosure.
Suitable options include:
- Large hide boxes
- Cork structures
- Hollow-log style shelters
- Covered elevated shelves
- Purpose-built enclosed retreats
The snake should be able to conceal most or all of its body.
Substrate
Suitable substrates include:
- Reptile-safe soil
- Coconut husk
- Cypress-type reptile substrate
- Suitable bark-based substrates
- Naturalistic soil mixtures
Large enclosures can also incorporate deeper substrate areas and leaf litter.
Avoid:
- Cedar
- Pine
- Artificially scented materials
- Excessively dusty substrates
Spot-clean waste promptly.
Temperature & Heating
Provide a clear thermal gradient.
Suitable general temperatures are approximately:
Basking surface: 31–33°C
Warm ambient area: approximately 26–29°C
Cooler area: approximately 23–26°C
Night: approximately 21–24°C
The entire enclosure should never be maintained at basking temperature.
A large snake requires substantial cooler areas where it can fully retreat from heat.
Basking
Provide a broad basking area rather than a tiny concentrated hot spot.
A large adult should be able to warm a useful portion of its body.
Elevated basking platforms can work particularly well.
Surface temperatures should be measured using an infrared thermometer.
Heating
Suitable heating systems may include appropriately installed:
- Halogen basking lamps
- Deep heat projectors
- Ceramic heat emitters
Large enclosures may require multiple appropriately controlled heat sources to create a useful basking zone.
All heating equipment must be thermostatically controlled.
Heat Guards
Scrub Pythons are exceptional climbers.
Any internally mounted heating equipment accessible to the snake must be securely guarded.
Guards must be:
- Strong
- Securely attached
- Large enough to prevent contact with hot equipment
A powerful adult may dislodge poorly fitted guards.
Thermal burns can cause severe injury.
Humidity
A useful general humidity range is approximately:
60–80% relative humidity
with natural fluctuations.
Humidity can temporarily increase following:
- Misting
- Rain simulation
- Overnight cooling
Good ventilation remains essential.
Humidity & Ventilation
High humidity should not mean permanently wet conditions.
The enclosure should experience cycles of:
- Increased humidity
- Surface drying
- Fresh air exchange
Persistently wet substrate combined with poor ventilation can contribute to:
- Scale problems
- Bacterial growth
- Fungal growth
- Respiratory disease
Humid Retreat
A localised humid retreat can be particularly useful during shedding.
Suitable materials include:
- Damp sphagnum moss
- Moist coconut fibre
- Other moisture-retaining reptile-safe substrate
The contents should remain damp rather than waterlogged.
Water
Fresh drinking water should be available at all times.
Adult Scrub Pythons require a large, stable water container.
The container should be:
- Difficult to overturn
- Easy to remove or drain
- Easy to disinfect
- Large enough for comfortable drinking
Some individuals may soak.
Water should be replaced immediately when contaminated.
Lighting
Provide a clear day/night cycle.
Approximately:
10–12 hours of light per day
is suitable, with seasonal variation possible.
Bright visible daytime lighting helps establish a strong photoperiod.
The enclosure should become genuinely dark at night.
Avoid red, blue or purple nighttime bulbs.
UVB
Low-level UVB can be incorporated into modern Scrub Python husbandry.
A useful exposed basking target may be approximately:
UVI 1–2
with shaded areas and retreats providing negligible exposure.
The snake must always be able to regulate its own exposure.
Actual UV intensity depends upon:
- Lamp output
- Reflector
- Distance
- Mesh
- Basking position
Environmental Enrichment
Scrub Pythons are highly active and inquisitive.
Environmental enrichment should be considered a fundamental part of husbandry.
Provide:
- Large climbing structures
- Elevated platforms
- Multiple hides
- Vegetation
- Logs
- Cork
- Different substrate depths
- Leaf litter
- Scent trails
- Changes in environmental arrangement where appropriate
The environment should encourage:
- Exploration
- Climbing
- Basking
- Concealment
- Foraging
- Thermoregulation
Diet
Scrub Pythons are carnivorous constrictors.
Wild prey may include:
- Rodents
- Other mammals
- Birds
- Reptiles
- Other appropriately sized vertebrates
Large adults are capable of consuming substantial prey.
Captive animals should nevertheless be offered appropriately sized meals rather than the largest prey they are physically capable of swallowing.
Captive Diet
Appropriate whole prey may include:
- Mice for juveniles
- Rats
- Other suitable whole prey according to snake size
Dietary variety can be incorporated where appropriate.
Prey size and feeding frequency should be based upon body condition.
Frozen-Thawed Prey
Appropriately prepared frozen-thawed prey is strongly preferred.
Live rodents can inflict serious injuries.
Frozen prey should be:
- Completely thawed
- Appropriately warmed
- Presented using long feeding tongs
Never microwave whole frozen prey because uneven heating can create dangerous internal hot spots.
Prey Size
Offer prey appropriate to the snake’s current size and body condition.
A meal should produce a modest visible swelling rather than extreme distension.
Large Scrub Pythons do not need enormous meals simply because they are capable of consuming them.
Feeding Frequency
Juveniles can generally be offered appropriately sized prey approximately:
Every 5–7 days
depending upon growth and body condition.
Subadults may generally be fed approximately:
Every 7–10 days.
Healthy adults may generally be fed approximately:
Every 10–21 days
depending upon:
- Prey size
- Body condition
- Activity
- Season
- Reproductive status
Large adults should not be power-fed.
Obesity
Obesity is a significant husbandry concern with large captive pythons.
Monitor:
- Body shape
- Muscle tone
- Activity
- Weight trends
A healthy Scrub Python should retain an athletic, muscular appearance.
Feeding should be based upon body condition rather than appetite alone.
Feeding Response
Scrub Pythons can possess an extremely strong feeding response.
Large individuals have considerable speed and reach.
Safe feeding management should include:
- Long feeding tongs
- Predictable feeding routines
- Avoiding prey scent during maintenance
- Establishing the snake’s location before opening the enclosure
- Target or tap training where appropriate
Never assume that a normally calm animal cannot switch rapidly into feeding behaviour.
Target Training
Target training can be particularly useful with large Scrub Pythons.
The snake can learn to associate a specific visual target with feeding.
This may help distinguish between:
- Feeding sessions
- Cleaning
- Handling
- Routine maintenance
Consistent training can improve predictability and facilitate safer management.
Handling
Scrub Pythons should not be treated as casual handling snakes.
Even relatively calm individuals are:
- Fast
- Powerful
- Highly alert
- Capable of considerable reach
Handling should have a purpose and should be undertaken calmly and confidently.
The body should be adequately supported.
Large Adult Handling
Large adults require particularly careful management.
For substantial specimens, having another experienced adult present during major handling or enclosure maintenance is strongly recommended.
Never:
- Place a large python around the neck
- Allow uncontrolled access to the face
- Handle while carrying prey scent
- Handle immediately following feeding
- Underestimate strike range
A management plan should be established before the animal reaches adult size.
Handling After Feeding
Avoid unnecessary handling for approximately:
48–72 hours after feeding
and longer following substantial meals.
Allow the snake to digest undisturbed at appropriate temperatures.
Defensive Behaviour
Defensive behaviour can include:
- S-shaped posture
- Hissing
- Rapid striking
- Attempted escape
Juveniles may be particularly reactive.
Persistent defensive behaviour should prompt review of:
- Enclosure security
- Hiding opportunities
- Environmental conditions
- Disturbance
- Feeding routines
Shedding
Signs of an approaching shed include:
- Dull colouration
- Cloudy or blue eyes
- Reduced activity
- Possible temporary feeding refusal
Appropriate hydration and humidity generally support normal shedding.
After shedding, check:
- Eye caps
- Tail tip
- Overall skin
Repeated incomplete shedding indicates that hydration, humidity or general health should be reviewed.
Housing Multiple Snakes
Individual housing is generally recommended.
Scrub Pythons do not require companionship.
Separate housing allows accurate monitoring of:
- Feeding
- Faeces
- Shedding
- Body condition
- Behaviour
- Health
Animals should only be introduced for breeding under controlled conditions.
Health
Potential health concerns include:
- Respiratory infections
- Mouth infections
- Burns
- Scale problems
- Dehydration
- Retained shed
- External parasites
- Internal parasites
- Regurgitation
- Obesity
- Reproductive complications
Warning signs include:
- Significant unexplained weight loss
- Persistent refusal to feed
- Repeated regurgitation
- Wheezing
- Open-mouth breathing
- Nasal discharge
- Excessive saliva
- Mouth swelling
- Neurological abnormalities
- Significant behavioural changes
Persistent or serious symptoms require assessment by a suitably experienced reptile/exotic veterinarian.
Burns
Large climbing pythons can easily reach poorly protected heating equipment.
Prevent burns by:
- Thermostatically controlling all heat sources
- Using strong heat guards
- Measuring surface temperatures
- Inspecting guards and fittings regularly
Suspected burns require prompt veterinary attention.
Respiratory Disease
Respiratory problems can be associated with inappropriate combinations of:
- Temperature
- Humidity
- Ventilation
- Hygiene
Possible signs include:
- Wheezing
- Clicking
- Nasal discharge
- Excessive saliva
- Open-mouth breathing
Suspected respiratory disease requires veterinary assessment.
Quarantine
All newly acquired Scrub Pythons should undergo strict quarantine away from established reptiles.
During quarantine:
- Record body weight
- Monitor feeding
- Examine faeces
- Check skin
- Monitor breathing
- Check carefully for mites
- Observe behaviour
- Maintain separate equipment
Veterinary faecal testing may be appropriate, particularly for animals with uncertain histories.
Captive-Bred vs Wild-Origin Animals
Captive-bred animals should be strongly preferred.
Animals of wild or uncertain origin can present increased risks of:
- Parasites
- Dehydration
- Chronic stress
- Defensive behaviour
- Feeding difficulties
- Unknown health history
Responsible sourcing is particularly important with species originating from regions where wild collection may occur.
Sexing
Scrub Pythons can be sexed using established professional snake-sexing techniques.
These procedures should only be performed by an experienced person.
Incorrect probing can cause serious injury.
External appearance alone should not be relied upon for definitive sex determination.
Breeding
Scrub Pythons are egg-laying snakes.
Breeding should only be attempted with healthy mature animals in appropriate body condition and by keepers able to accommodate both adults and resulting offspring responsibly.
Successful breeding requires knowledge of:
- Accurate sexing
- Sexual maturity
- Seasonal cycling
- Pair introduction
- Courtship
- Female condition
- Ovulation
- Egg development
- Egg laying
- Incubation
- Hatchling husbandry
Pair Introduction
Adults should normally be housed individually and introduced specifically for breeding.
Introductions should be carefully supervised.
Monitor for:
- Courtship
- Copulation
- Stress
- Defensive behaviour
Animals should be separated if either individual appears persistently stressed.
Egg Laying
Females require access to a secure laying area.
The nesting site should provide:
- Privacy
- Appropriate moisture
- Stable temperature
- Sufficient space for the female to coil comfortably
Females should be monitored carefully during the reproductive period.
Difficulty laying eggs can become a veterinary emergency.
Maternal Incubation
Female pythons may coil around their eggs.
Maternal incubation may be possible under carefully controlled environmental conditions.
Artificial incubation may also be used.
The chosen approach should be thoroughly researched before breeding occurs.
Artificial Incubation
Eggs require carefully controlled:
- Temperature
- Moisture
- Gas exchange
Eggs should not be unnecessarily rotated after development has begun.
Current species-specific breeding information should be consulted before incubation is attempted.
Hatchlings
Hatchlings require:
- Secure individual accommodation
- Appropriate thermal gradients
- Multiple hides
- Elevated retreats
- Fresh water
- Suitable substrate
- Climbing opportunities
- Appropriately sized prey
Young Scrub Pythons can be extremely fast and defensive.
Each hatchling should be individually monitored for:
- First shed
- Feeding
- Body weight
- Defecation
- Hydration
- Normal development
Species & Locality Records
The amethystine python complex contains several related species and geographic populations.
Accurate records are therefore particularly important.
Where known, retain:
- Parent identification
- Species identification
- Geographic origin
- Hatch date
- Sex
- Feeding history
- Breeding history
- Lineage
Animals should not be represented as pure locality animals without reliable supporting information.
Responsible Sourcing
Before acquiring a Scrub Python, establish where possible:
- Captive-bred status
- Exact species
- Geographic origin
- Age
- Sex
- Feeding history
- Health history
- Lineage
Animals with documented captive-bred provenance should be strongly preferred.
Legal Considerations
Wildlife legislation and trade requirements vary between countries and can change.
Before acquiring, breeding, transporting, importing or exporting a Scrub Python, keepers should confirm current requirements applicable to their jurisdiction.
International movement may require wildlife documentation or permits depending upon the circumstances.
Never assume that previous requirements remain current.
Responsible Ownership
Scrub Pythons can represent a commitment of 20 years or longer.
Before acquiring one, consider:
- Potential adult length exceeding 3 metres
- Exceptional enclosure requirements
- Strong climbing requirements
- Powerful feeding response
- Adult handling considerations
- Whole-prey feeding
- Heating and humidity costs
- Specialist veterinary care
- Long lifespan
A small juvenile can eventually become an exceptionally long, powerful and fast adult.
Suitable adult accommodation and a safe management strategy should therefore be planned before acquisition.
Never release a captive snake into the wild.
Summary
The Amethystine or Scrub Python is an extraordinary large python combining considerable adult length with speed, athleticism and exceptional climbing ability.
Successful husbandry requires an exceptionally spacious and secure enclosure, extensive climbing structures, multiple retreats, a broad thermal gradient, appropriate humidity combined with good ventilation, fresh water, environmental enrichment and carefully controlled whole-prey feeding.
Its strong feeding response, considerable reach and eventual adult size make it an advanced species requiring thoughtful management.
Captive-bred animals of documented origin should be strongly preferred.
With sufficient space, environmental complexity and experienced long-term care, Simalia amethistina can be an impressive species to maintain in captivity.
IMPORTANT INFORMATION
This care sheet provides general husbandry guidance and does not replace species-specific research or veterinary advice. Individual requirements may vary.
If you have concerns about an animal’s health or care, consult a suitably experienced exotic or reptile veterinarian.
Information correct at the date of publication.
reptilecommunity.com | Revised: August 2026