Green Keel-Bellied Lizard (Gastropholis prasina) Care Sheet
The Green Keel-Bellied Lizard (Gastropholis prasina) is a striking arboreal lacertid native to coastal East Africa. Its brilliant green colouration, elongated body, long prehensile-like tail and exceptional climbing ability make it one of the most distinctive lizards occasionally maintained in specialist reptile collections.
Unlike the predominantly terrestrial European lacertids, Gastropholis prasina is highly adapted to life above ground. It spends much of its time climbing through vegetation, branches and tree trunks.
Green Keel-Bellied Lizards are active, intelligent and visually alert. They can become confident in well-designed captive environments but are fast-moving animals that generally benefit from minimal unnecessary handling.
Successful husbandry centres on a tall, densely furnished enclosure, strong UVB, bright visible lighting, appropriate basking opportunities, high but well-ventilated humidity, abundant climbing structure and a varied diet of appropriately supplemented invertebrates.
Quick Facts
Scientific name: Gastropholis prasina
Common name: Green Keel-Bellied Lizard
Family: Lacertidae
Native range: Coastal East Africa, particularly Kenya and Tanzania
Lifestyle: Highly arboreal
Activity: Diurnal
Adult length: Approximately 16–20 inches including the long tail
Lifespan: Approximately 8–12+ years with excellent care
Experience level: Intermediate
Diet: Primarily insectivorous
Temperament: Alert, fast and generally shy but capable of becoming confident
Adult enclosure: Approximately 36" × 18" × 36" minimum for a single adult; larger strongly preferred
Basking surface: Approximately 32–35°C
Warm ambient: Approximately 25–28°C
Cool area: Approximately 22–24°C
Night temperature: Approximately 19–22°C
Humidity: Approximately 60–80% with excellent ventilation and daily fluctuations
UVB: Essential
Handling: Minimal
Social housing: Individual housing safest; compatible pairs may be maintained by experienced keepers
Natural Distribution
Green Keel-Bellied Lizards originate from coastal regions of East Africa.
Their natural distribution includes areas of:
- Kenya
- Tanzania
They inhabit warm, humid environments containing dense vegetation and substantial arboreal structure.
Natural Habitat
Gastropholis prasina is strongly associated with vegetation.
Natural habitats include:
- Coastal forest
- Woodland
- Dense scrub
- Vegetated forest margins
- Trees and shrubs
They spend much of their time above ground.
Captive accommodation must therefore prioritise vertical space.
Appearance
Green Keel-Bellied Lizards are usually vivid green.
Typical features include:
- Bright green body
- Keeled scales
- Long slender limbs
- Extremely long tail
- Pointed head
- Large alert eyes
- Strong climbing feet
Their colour provides excellent camouflage among leaves.
Adult Size
Adults generally reach approximately:
16–20 inches total length
A considerable proportion of this length consists of the tail.
The body itself remains relatively slender.
Tail
The long tail plays an important role in:
- Balance
- Climbing
- Movement through vegetation
Never restrain the animal by its tail.
Tail injury or autotomy can occur.
Behaviour
Green Keel-Bellied Lizards are active during daylight.
Typical behaviours include:
- Basking
- Climbing
- Hunting insects
- Moving through foliage
- Exploring branches
- Resting among vegetation
They can move extremely quickly when frightened.
Temperament
Captive-bred individuals can become relatively confident.
However, this is not generally a lizard suited to frequent handling.
Excessive handling may cause unnecessary stress.
They are best appreciated as active naturalistic display animals.
Handling
Handling should generally be limited to situations where it is necessary.
When handling:
- Move slowly
- Support the body
- Avoid grabbing the tail
- Keep the animal close to a secure surface
- Keep sessions brief
Allowing the lizard to approach voluntarily is preferable to chasing it around the enclosure.
Enclosure Size
For a single adult:
36" × 18" × 36"
should be considered a practical minimum.
Larger accommodation such as:
36" × 24" × 48"
or larger is strongly preferred where space allows.
Vertical space is particularly important.
Arboreal Design
The enclosure should contain climbing opportunities throughout its full height.
Provide:
- Vertical branches
- Horizontal branches
- Diagonal branches
- Cork bark
- Vines
- Live plants
- Artificial foliage
The lizard should be able to travel throughout the enclosure without repeatedly descending to the floor.
Foliage
Dense vegetation provides essential visual security.
Suitable plants may include robust reptile-safe species such as:
- Pothos
- Ficus
- Schefflera
- Bromeliads
Artificial plants can also supplement live planting.
Ensure any plants used are non-toxic and have not been treated with pesticides.
Hides
Traditional ground hides alone are insufficient.
Provide elevated hiding opportunities using:
- Dense foliage
- Cork tubes
- Hollow branches
- Mounted hides
Ground-level retreats can also be provided.
Enclosure Security
Green Keel-Bellied Lizards are extremely fast.
The enclosure must be secure.
Check:
- Door gaps
- Ventilation panels
- Cable ports
- Sliding tracks
- Lid openings
Always know where the animal is before opening the enclosure.
Substrate
Suitable substrates include:
- Organic topsoil
- Coco fibre
- Cypress mulch
- Orchid bark
- Bioactive tropical mixtures
The substrate should help maintain humidity without remaining permanently waterlogged.
Bioactive Housing
This species is particularly well suited to a properly established bioactive enclosure.
A bioactive system may include:
- Live plants
- Leaf litter
- Springtails
- Isopods
- Naturalistic soil layers
Bioactive housing does not eliminate the need for routine cleaning and health monitoring.
Basking Temperature
Provide a localised basking surface around:
32–35°C
The remainder of the enclosure should remain considerably cooler.
Warm Ambient Temperature
The warmer region can generally remain around:
25–28°C
Cool Area
Provide cooler areas around:
22–24°C
Dense foliage should allow the lizard to retreat completely from the basking zone.
Night Temperature
Night temperatures can generally fall to approximately:
19–22°C
A modest nighttime temperature reduction is appropriate.
Heating
Overhead heating is recommended.
A suitable halogen basking lamp can provide a localised basking area.
Because the species is arboreal, ensure the animal cannot climb dangerously close to the heat source.
Thermostat
Heating equipment should be appropriately controlled.
Use independent thermometers to measure temperatures at:
- Basking height
- Mid-enclosure
- Lower enclosure
Vertical enclosures can develop substantial temperature differences between levels.
UVB
UVB is essential.
Green Keel-Bellied Lizards are diurnal animals that naturally receive sunlight while moving through vegetation.
Provide an appropriate linear UVB lamp across part of the enclosure.
The animal must have access to:
- UVB exposure
- Partial shade
- Dense foliage
- Complete shade
UV Gradient
Do not attempt to illuminate every part of the enclosure equally.
A naturalistic gradient allows the lizard to regulate its own exposure.
Always account for:
- Lamp strength
- Distance
- Mesh obstruction
- Manufacturer guidance
Lighting
Bright visible lighting is highly beneficial.
A well-lit enclosure encourages:
- Natural activity
- Basking
- Plant growth
- Normal day/night behaviour
Approximately:
12 hours of daylight
is appropriate for much of the year.
Humidity
General humidity around:
60–80%
is appropriate.
Humidity should fluctuate rather than remain constantly at its maximum level.
Misting
Misting can be carried out once or twice daily depending on:
- Enclosure ventilation
- Substrate
- Planting
- Room humidity
Misting provides drinking droplets and temporarily raises humidity.
Allow some drying between misting periods.
Ventilation
High humidity must be combined with excellent ventilation.
A permanently warm, stagnant and saturated enclosure can contribute to:
- Respiratory disease
- Skin problems
- Mould
- Bacterial growth
Good cross-ventilation is highly desirable.
Water
Provide fresh drinking water at all times.
A small stable water bowl should be available even if the lizard frequently drinks from leaves after misting.
Change the water daily or whenever contaminated.
Diet in the Wild
Green Keel-Bellied Lizards are primarily insectivorous.
Natural prey includes a variety of:
- Insects
- Spiders
- Other small arthropods
Captive diets should reproduce this diversity as closely as practical.
Captive Diet
Suitable feeder insects include:
- Crickets
- Locusts
- Dubia roaches
- Other suitable roaches
- Silkworms
- Calciworms / black soldier fly larvae
- Mealworms
- Morio worms in moderation
Dietary variety is extremely important.
Gut Loading
All feeder insects should be well gut-loaded.
Feed insects nutritious foods before offering them to the lizard.
Suitable gut-loading diets may contain:
- Leafy greens
- Vegetables
- Appropriate commercial gut-loading products
Poorly maintained feeder insects provide poor nutrition.
Calcium
Feeder insects should be appropriately dusted with calcium.
Calcium requirements depend on:
- Age
- Reproductive status
- Diet
- UVB exposure
Growing juveniles and breeding females require particularly careful calcium management.
Multivitamins
A suitable reptile multivitamin can be used periodically.
Avoid excessive supplementation.
Feeding Juveniles
Growing juveniles may be offered appropriately sized insects:
Daily or 5–6 days per week
Monitor growth and body condition.
Feeding Adults
Adults can generally be fed approximately:
3–4 times per week
depending on:
- Prey size
- Body condition
- Activity
- Reproductive status
Prey Size
Feed appropriately sized insects.
Very large prey can be difficult to swallow and may cause unnecessary stress.
A varied selection of smaller prey is often preferable.
Uneaten Insects
Remove uneaten insects when necessary.
Large crickets left loose in an enclosure can disturb or potentially injure a resting lizard.
Food Enrichment
Encourage natural hunting behaviour.
Methods include:
- Releasing small numbers of insects into foliage
- Using feeding cups for selected feeders
- Tong-feeding
- Varying feeding locations
This encourages activity and exploration.
Social Housing
Individual housing is the simplest and safest approach.
Experienced keepers may maintain compatible male/female pairs in sufficiently large enclosures.
However, animals must be monitored for:
- Aggression
- Competition
- Stress
- Unequal feeding
- Persistent breeding pressure
Multiple males should not normally be housed together.
Sexing
Adult males may develop:
- Broader heads
- More prominent femoral pores
- Greater overall robustness
Sexing juveniles can be difficult.
Professional sexing methods may be necessary when certainty is required.
Breeding
Captive breeding is achievable and should be encouraged because captive-bred animals are preferable to wild-caught imports.
Healthy mature animals require:
- Excellent nutrition
- Correct UVB
- Appropriate temperatures
- Suitable seasonal cues
- Adequate space
Egg Laying
Green Keel-Bellied Lizards are oviparous.
Females require access to suitable nesting substrate.
A laying area should contain deep, slightly moist substrate that allows excavation.
Clutch Size
Females generally produce relatively small clutches.
Approximately:
2–5 eggs
may be produced, although clutch size can vary.
More than one clutch may be produced during a breeding season.
Incubation
Eggs can generally be incubated at approximately:
25–27°C
under stable humid conditions.
Incubation duration varies with temperature and other conditions.
Eggs should not be rotated after laying.
Hatchlings
Hatchlings require:
- Extremely secure housing
- Fine climbing branches
- Dense foliage
- Appropriate UVB
- Gentle basking heat
- High but ventilated humidity
- Tiny feeder insects
Their small size makes escape prevention especially important.
Quarantine
All newly acquired animals should undergo quarantine.
A minimum of approximately:
90 days
is a sensible starting point.
Monitor:
- Feeding
- Weight
- Faeces
- Skin
- Respiration
- Shedding
- External parasites
Wild-Caught Animals
Wild-caught individuals may arrive with:
- Parasites
- Dehydration
- Injuries
- Chronic stress
- Feeding problems
Captive-bred animals should be strongly preferred wherever available.
Parasite Screening
Veterinary faecal testing is particularly advisable for wild-caught or uncertain-origin animals.
Treatment should be based on appropriate diagnosis.
Shedding
Green Keel-Bellied Lizards shed in patches.
Appropriate hydration and humidity normally allow shedding to proceed without difficulty.
Pay particular attention to retained skin around:
- Toes
- Tail
- Limbs
Signs of Good Health
A healthy Green Keel-Bellied Lizard should generally display:
- Bright clear eyes
- Strong grip
- Alert daytime behaviour
- Regular basking
- Strong feeding response
- Smooth coordinated climbing
- Healthy body condition
- Normal faeces
Warning Signs
Seek veterinary advice for:
- Persistent food refusal
- Unexplained weight loss
- Weak grip
- Tremors
- Swollen limbs
- Soft jaw
- Respiratory symptoms
- Persistent diarrhoea
- Skin lesions
- Severe retained shed
- Abnormal swelling
- Lethargy
Common Husbandry Mistakes
Enclosure Too Short
This is a highly arboreal species.
Sparse Furnishings
Dense climbing structure and foliage are essential.
Weak UVB
Appropriate UVB is fundamental to long-term health.
No Basking Area
Despite requiring humidity, these lizards still require proper basking heat.
Constantly Wet Conditions
Humidity should fluctuate and ventilation must remain excellent.
Poor Diet Variety
Do not rely exclusively on crickets or mealworms.
No Gut Loading
Feeder insect quality directly affects reptile nutrition.
Excessive Handling
These fast arboreal lizards generally prefer minimal handling.
Grabbing the Tail
Tail damage or autotomy may occur.
Poor Enclosure Security
Escaped individuals can be extremely difficult to recover safely.
Captive-Bred Versus Wild-Caught
Captive-bred Green Keel-Bellied Lizards should be strongly preferred.
Advantages include:
- Reduced parasite risk
- Known origin
- Better adaptation to captive conditions
- Greater likelihood of confident behaviour
- Reduced pressure on wild populations
Supporting responsible captive breeding helps establish this species sustainably within herpetoculture.
Responsible Ownership
Before acquiring Gastropholis prasina, ensure you can provide:
- A tall permanent enclosure
- Extensive climbing structure
- Dense foliage
- Strong appropriate UVB
- Bright visible lighting
- Controlled basking heat
- High but well-ventilated humidity
- A varied supply of feeder insects
- Appropriate supplementation
- Long-term veterinary care
Suitability
Advantages
- Exceptional vivid green colouration
- Active during daylight
- Fascinating arboreal behaviour
- Intelligent and visually alert
- Manageable body size
- Excellent planted-display species
- Captive breeding achievable
Considerations
- Very fast
- Requires a tall enclosure
- Strong UVB is essential
- Requires regular live insect feeding
- Humidity and ventilation must be balanced carefully
- Not ideal for frequent handling
- Wild-caught specimens should be avoided where captive-bred animals are available
- Long-term commitment
Summary
The Green Keel-Bellied Lizard (Gastropholis prasina) is a spectacular arboreal African lacertid particularly well suited to spacious, densely planted naturalistic enclosures.
Successful husbandry centres on:
- Approximately 36" × 18" × 36" minimum adult accommodation
- Larger and taller accommodation wherever possible
- Extensive branches and climbing routes
- Dense foliage
- A basking surface around 32–35°C
- A cool area around 22–24°C
- Strong appropriate UVB
- Bright daytime lighting
- Approximately 60–80% humidity with natural fluctuations
- Excellent ventilation
- Fresh drinking water
- A varied gut-loaded invertebrate diet
- Appropriate calcium supplementation
- Minimal unnecessary handling
- Preference for captive-bred animals
When provided with sufficient vertical space, strong lighting, dense vegetation and appropriate nutrition, captive-bred Green Keel-Bellied Lizards can make outstanding active display reptiles.
IMPORTANT INFORMATION:
This care sheet provides general husbandry guidance and does not replace species-specific research or veterinary advice. Individual requirements may vary.
Always check current legislation governing the acquisition, collection, import, transport, keeping, breeding or sale of reptiles in your jurisdiction.
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