The green iguana is often seen as a cool pet because of its vivid color and dramatic size as an adult. But behind that exotic look, the green iguana is one of the most demanding reptiles to keep properly at home. Adults can reach 1.5–2 metres including the tail, live 15–20 years, and need a large custom enclosure, the right temperature gradient, consistent UV-B, and a very specific 100% herbivore diet. MBD (metabolic bone disease) is the number-one cause of death in captive iguanas in Indonesia — and it is almost 100% preventable with correct husbandry.
This article is a guide for those of you considering adopting a green iguana or who have just bought a baby iguana from the market — the legality you should understand first, the iguana's natural temperament that is so often misunderstood, the minimum enclosure setup, the very specific diet, the clinical problems that commonly arise, and when you must take it to an exotic vet. Disclaimer: this is general guidance based on international reptile husbandry and exotic medicine principles, not a substitute for a direct consultation with an exotic vet for your specific iguana's condition.
Green iguana legality in Indonesia
Things you must understand BEFORE you buy — not after:
- CITES Appendix II — the green iguana (Iguana iguana) is listed under CITES Appendix II, which means international trade is restricted and requires official documentation (a CITES permit for import/export). Appendix II status does not mean it is banned, but it does require a documented legal pathway.
- DO NOT buy wild-caught — many baby iguanas in Indonesian animal markets are wild-caught from South/Central America via unclear channels, with a very high transport mortality rate (many die in transit) and ethically problematic. Look for captive-bred animals from a reputable breeder/reseller with valid documentation.
- Verify documentation: ask for a certificate of origin, a CITES permit if imported, and captive-bred documentation. A reputable seller will not mind showing the documents.
- Invasive status in other countries: in some places (Florida USA, Taiwan, several Pacific islands), the green iguana is an invasive species that has escaped from owners and damages local ecosystems. In Indonesia the status is not yet that strict, but owner responsibility remains the same — NEVER release an iguana into the wild.
- Verify local government / Agricultural Quarantine regulations before buying — rules on inter-province transport, ownership, and trade can differ.
If documentation is unclear or the seller dodges questions about origin, don't buy — beyond the legal risk, an unclear source usually means wild-caught with high stress and parasite load.
The iguana's nature, often misunderstood
Before talking about setup, it's important to understand who the green iguana really is:
- Arboreal — in the wild green iguanas live in trees, not on the ground. They need a vertical enclosure (tall, not horizontally wide) with plenty of branches to climb. Picture an enclosure like a tree, not a flat box.
- Strict herbivore — counter-intuitive but 100% true: the adult green iguana is an obligate herbivore, not an omnivore. Feeding animal protein (chicken, fish, insects, crickets) to an iguana damages the kidneys long-term. Unfortunately many market sellers suggest "give it protein so it grows faster" — this is a dangerous myth.
- Large adult size — a total of 1.5–2 metres (mostly tail), 5–7 kg in males. A baby the size of your hand will grow to the size of a medium dog within 4–5 years.
- Long lifespan — 15–20 years with good care, with some reports of 20+. A long-term commitment like raising a child.
- Solitary temperament + can be aggressive as an adult — especially males during breeding season. They can bite, scratch, or strike hard with the tail (whip tail). Not a friendly pet for small children without close supervision. Iguanas that are "tame" as babies often become defensive as adults due to hormones.
- Dislikes constant handling — contrary to the reputation of a "cute lap pet." Excessive handling causes chronic stress. Best practice: minimise handling, observe from outside the enclosure, handle only when necessary (health checks, transfers).
Many iguanas in Indonesia die young or are abandoned because owners are shocked by the adult size + temperament, despite this being a 10+ year commitment. Think long-term before adopting.
The iguana enclosure — vertical, large, custom
The glass aquarium or small plastic cage often sold for babies is suitable for the first 6 months at most. Iguanas grow very fast and need regular upgrades. Many owners get stuck because they are not prepared for an adult's enclosure needs.
Minimum size
- Baby (length < 30 cm): minimum enclosure 90 × 45 × 90 cm (tall)
- Sub-adult (30–80 cm): minimum 150 × 75 × 150 cm
- Adult (> 1 metre): minimum 200 × 100 × 200 cm (2m × 1m × 2m) — many experienced owners use a custom enclosure of 240 × 120 × 240 cm or even a dedicated room
The enclosure must be taller than it is wide (vertical orientation). Not a long horizontal box like a terrestrial reptile enclosure.
Material and construction
- Material: wood with a weather-resistant finish (non-toxic sealer), PVC, or a metal frame with fine mesh panels. Glass is not ideal for iguanas because it retains humidity too long and becomes a thermal trap when the lamp is on
- Good ventilation at the top (heat rises and needs an exhaust) but not drafty from the sides
- A large door for cleaning access and safely handling the iguana
- Substrate: reptile carpet, paper towel (for babies — easy to monitor faeces and health), or cypress mulch with moderate moisture. AVOID fine sand (impaction risk), small gravel, cedar/pine shavings (toxic)
Enclosure furniture
- Plenty of branches of varying diameter for climbing and grip — the largest diameter should be at least as wide as the iguana's body at mid-section (so the toes can wrap around comfortably)
- A basking platform near the UV-B + heat lamp (high level)
- Plastic leaves or plant decoration for visual cover and a sense of security
- A hiding spot / hide box at a low level for resting
- A large water bowl — iguanas like to soak and drink from a bowl, change the water daily
- A food dish that is shallow and easy to clean
Temperature, humidity, and UV-B — non-negotiable
Heat gradient
Iguanas are ectothermic — body temperature is regulated by moving between warm and cool areas. The enclosure must have a clear gradient:
- Basking spot (day): 32–35°C — the area under the heat lamp where the iguana basks
- Ambient day: 27–30°C — most of the enclosure
- Cool spot: 24–26°C — a shaded area for thermoregulation
- Night: drop to 22–25°C, must not go below 22°C
- Use a digital thermometer at a MINIMUM of 2 points (basking + ambient) — don't guess
Humidity
- 60–70% humidity — iguanas come from humid tropical forest, not desert
- Mist the enclosure 1–2× per day, or use an automatic mister
- A large water bowl helps retain humidity
- A humidity gauge in the enclosure for monitoring
UV-B lighting — essential for vitamin D3 and calcium synthesis
This is the most often-overlooked area and the biggest trigger of MBD. Without adequate UV-B, the iguana cannot synthesise vitamin D3 → cannot absorb calcium → MBD with shell deformation, brittle bones, paralysis, and early death.
- A 12% output UV-B lamp specifically for reptiles — a T5 HO format with a reflector is highly recommended for a large enclosure
- Duration of 10–12 hours per day with a timer
- Lamp-to-basking-spot distance: 25–40 cm depending on the brand's specifications — too far = useless
- Replace the bulb every 6–12 months even if it still lights up — UV-B output drops sharply before the bulb visibly dies
- No glass/plastic between the lamp and the iguana — both block UV-B
- Outdoor in direct sunlight 1–2 hours/day (safe weather): the best UV-B source, free, and far stronger than any lamp. But never leave the iguana alone outside (escape risk, overheating, predators)
Green iguana diet — 100% herbivore, strict
This is the most important and most often-mistaken area. The green iguana is an obligate herbivore — evolutionarily they are not adapted to metabolise animal protein. Feeding animal protein long-term damages the kidneys (chronic kidney disease is a common cause of death in captive iguanas with a wrong diet).
Ideal diet composition
- 80% dark leafy greens — the main base, high variety
- 15% other vegetables — non-leafy greens, low starch
- 5% fruit (maximum, occasional) — as a treat, not a staple
- 0% animal protein — NO chicken, fish, eggs, crickets, mealworms, dog food, or cat food for adult iguanas. Even baby iguanas, which are sometimes observed eating insects in the wild — captive-bred animals are better kept on a herbivore diet because the nutrition from added animal protein is not worth the long-term kidney damage
- Frequency: baby 2× per day, juvenile 1–2× per day, adult 1× per day (or even 4–5× per week — overfeeding causes obesity)
Recommended dark leafy greens
- Collard greens
- Mustard greens
- Dandelion (leaves + flowers) — high in calcium, much sought after by iguanas
- Hibiscus leaves — good, often eaten
- Turnip greens
- Endive, escarole
- Sweet potato leaves
- Grape leaves
- Mulberry leaves
- Edible flowers (calendula, hibiscus, dandelion flowers, nasturtium)
Vegetables (15% portion)
- Squash (butternut, acorn, ripe pumpkin)
- Bell pepper (red, yellow, green)
- Grated carrot (a little — high in vitamin A, can be over-supplemented)
- Young green beans
- Okra
- Chayote
Fruit (maximum 5%, occasional treat)
- Berries (strawberry, blueberry, raspberry)
- Apple without seeds
- Mango (a little, high in sugar)
- Papaya
- Banana (very little, high in sugar and low in calcium)
What MUST be avoided
- All animal protein: meat, fish, eggs, crickets, mealworms, dog food, cat food → long-term kidney damage
- Excessive spinach — very high in oxalate, blocks calcium absorption → increased MBD risk
- Excessive kale every day — goitrogenic (blocks the thyroid), safe in rotation but should not be a daily staple
- Rhubarb leaves — toxic (dangerous oxalate levels)
- Avocado — toxic to many reptiles
- Onion, scallion — toxic
- Iceberg lettuce — almost 0 nutrition, just water
- Milk, cheese, yoghurt — reptiles lack the lactase enzyme
- Excessive tomato — high acid, oxalate, low calcium
- Bread, rice, pasta, biscuits — simple starches that are not natural
Calcium supplementation
- Calcium powder without vitamin D3 dusted thinly over greens 3–5× per week (if outdoor + sunlight) or 5–7× per week (full indoor) — especially for babies/juveniles
- A reptile multivitamin with vitamin D3 1× per week — don't over-supplement (hypervitaminosis A or D3 is dangerous)
- A healthy adult iguana with good UV-B may not need as much as a baby — check with an exotic vet for a specific supplementation plan
Common iguana health problems
1. MBD (Metabolic Bone Disease) — the number-one cause of death
A condition where bones and jaw soften due to a deficiency of calcium and/or vitamin D3. Main causes: inadequate UV-B, a low-calcium diet (or one high in oxalate that blocks calcium), incorrect supplementation, a dark enclosure, or an expired UV-B lamp.
Clinical signs:
- Soft/rubbery lower jaw — if pressed it feels flexible (a healthy jaw is hard like normal bone)
- Swelling of the jaw or long bones
- Weak legs, difficulty walking, legs dragging
- Tremors or seizures (acute hypocalcaemia)
- Paralysis of the limbs (severe cases)
- Anorexia, lethargy
- Stunted growth in babies/juveniles
MBD is an emergency — go to an exotic vet immediately for serum calcium evaluation, X-rays (to assess bone density), diet + supplementation correction, and possibly injectable calcium. Without intervention, MBD progresses until it is fatal.
2. Kidney disease
Main causes: a long-term high animal-protein diet, chronic dehydration (an enclosure that is too dry), and a combination of both. Signs appear slowly (kidney disease is often "silent"):
- A palpable renal/pelvic mass (renal swelling is often felt at the back)
- Lethargy, anorexia, weight loss
- Drinking + urinating more (polyuria/polydipsia) — an early compensatory sign
- Stiffness, reluctance to move
Unfortunately iguana kidney disease often presents to the vet at an advanced stage (hard to reverse). Prevention = a strict herbivore diet + adequate hydration = far more effective than treatment.
3. Dystocia / egg-binding (adult females)
An adult female iguana can produce eggs even without ever mating (parthenogenic-like egg laying, similar to hens) — this often surprises owners who don't know. If there is no nesting site set up, or the female is dehydrated/weak, the eggs can become stuck (dystocia / egg-binding), which is an emergency:
- Refusing food for several weeks, lethargy, straining
- Abdominal swelling
- Weight loss despite a swollen belly
- Cloacal prolapse (severe cases)
Needs immediate exotic vet evaluation — sometimes medical management (oxytocin + calcium), sometimes surgical removal if it does not respond to medication.
4. Internal and external parasites
Wild-caught iguanas almost always have worms, protozoa, and ectoparasites (mites). A faecal exam with an exotic vet within the first 1–2 months after adoption is highly recommended for proper deworming (don't just use cat/dog dewormers — the wrong dose can be toxic).
5. Skin abscess / mouth rot (stomatitis)
A bacterial infection from a small wound, a sharp enclosure bite, or immunosuppression from poor husbandry. Signs: swelling, discharge, plaque in the mouth. Needs debridement + antibiotics from an exotic vet.
When you must take it to an exotic vet
A healthy iguana with good husbandry usually does not need frequent routine vet visits, but the following signs are an indication to consult immediately:
- Anorexia > 1 week (especially in babies/juveniles)
- Extreme lethargy, not moving, eyes closed constantly
- A soft or swollen jaw (MBD suspicion)
- Difficulty walking, weak legs, paralysis
- Tremors or seizures
- Noisy breathing, frequently open-mouth breathing, nasal discharge (respiratory infection)
- Persistent diarrhoea or blood present
- Abdominal swelling (kidney or egg-binding)
- A wound, abscess, or skin that won't heal
- Recently wild-caught — a baseline check within the first 2 months is essential (parasites, hydration, nutritional status)
Choose a vet with exotic medicine / reptile experience (ideally one familiar with ARAV — Association of Reptile and Amphibian Veterinarians — guidelines). A general dog-and-cat vet often lacks the tools (reptile X-ray, reptile blood work ranges) or the experience to handle a sick iguana correctly.
For adult iguana owners in Greater Jakarta, an exotic vet house call can be a practical option — transporting a large iguana with its custom enclosure to a clinic is very difficult and stressful for the animal.
FAQ
My iguana is still small, when should I plan for an adult enclosure?
Start planning the adult enclosure before you buy the iguana. A baby in its first 6 months can live in a 90×45×90 cm enclosure, but after that it needs regular upgrades every 6–12 months. An adult enclosure is minimum 2×1×2 metres — that is dedicated space requiring room and budget. Many owners get stuck in year 2 because they were not prepared for a large enclosure = a stressed iguana + MBD from a cramped enclosure and inadequate UV-B coverage.
My iguana won't eat greens, only fruit or pellets, why?
A picky-eater iguana behaves like a small child spoiled with junk food. If it got used to fruit/pellets/protein from the start, it is hard to transition to greens. Strategy: gradually mix greens with favourite foods (mix dandelion into small pieces of banana, gradually shift the ratio over 4–8 weeks), use brightly coloured greens (hibiscus, collard, mustard), and make sure the basking temperature is adequate (an iguana with a low body temperature is too lethargic to eat anything). If anorexia lasts > 1–2 weeks, consult an exotic vet to rule out a medical cause.
Can I handle my iguana every day to tame it?
Excessive handling actually causes chronic stress in iguanas (in contrast to dogs/cats, which are social mammals). Best practice: minimise handling, observe from outside the enclosure, handle only when necessary (health checks, transfers, cleaning). A "tame" iguana handled often as a baby frequently becomes defensive and aggressive as an adult due to hormones — handling does not guarantee a tame adult. Better: build trust through routine feeding (the iguana will associate you with food) without forcing physical contact.
Is a regular UV-B lamp from the pet shop enough?
It depends on the specifications. What you need: 10–12% UV-B output (for an intermediate tropical-arid reptile), a reputable brand (Arcadia, Zoo Med, Exo Terra), a T5 HO format for a large enclosure (or T8 for a juvenile). An ordinary UV/black light from a general lighting store is NOT adequate — it does not emit the correct UV-B. Check the UVB percent on the packaging + replace the bulb every 6–12 months even if it still lights up. Outdoor sunlight for 1–2 hours without glass/plastic in between is always more powerful than any lamp.
How long can a green iguana live?
15–20 years with good care, with some reports of 20+. Many iguanas in Indonesia die young (1–3 years) due to wrong husbandry (especially MBD from a dark enclosure with no UV-B, or an animal-protein diet). A full lifespan = a long-term commitment, so think about a succession plan (who will care for it if you can't) before adopting a baby.
Can Prabasavet make a house call for an iguana?
Yes. An adult iguana with a large custom enclosure actually benefits greatly from a home visit — transporting an iguana to a clinic is very difficult (large enclosure + defensive temperament) and transport stress can worsen a sick animal's condition. The vet can also observe your enclosure setup directly and suggest relevant husbandry tweaks. When you message on WhatsApp, mention the iguana's size/age, the condition you are concerned about, and your area — our team will find a partner vet with experience handling reptiles.
Closing
Keeping a green iguana can be very rewarding for an owner ready for a long-term commitment — they are iconic, intelligent in their reptilian way, and have a dramatic presence. But they are not a pet for everyone. A large custom enclosure, consistent UV-B, a strict 100% herbivore diet, and access to an exotic vet when their condition worsens are investments that are not cheap in time or budget.
If you are only just considering adoption, be honest with yourself: are you ready for an iguana the size of a medium dog that needs dedicated space for 15+ years? If yes — do it right from the start so your iguana lives a full lifespan without MBD. If you have doubts, perhaps another reptile with lighter needs (leopard gecko, crested gecko) would be a more realistic alternative for a beginner.
Need a consultation or to schedule a vet house call for your iguana? Contact us via WhatsApp — mention the iguana's size/age, the condition you are concerned about, and your area, and our team will find a partner vet with experience handling reptiles.
Read also: Keeping a Land Tortoise: Types, Food, and Enclosure, Keeping an Aquatic Turtle: Aquarium, Diet, and UV-B, Pet Care Guide, Exotic Vet House Call.
Medical references used in this article
This article was compiled with reference to the following sources, verified per clinical statement:
- Girling SJ, Raiti P (eds). BSAVA Manual of Reptiles 2nd ed. — chapters on lizard husbandry, herbivorous reptile nutrition, MBD prevention and therapy, dystocia management
- Mader DR, Divers SJ (eds). Mader's Reptile and Amphibian Medicine and Surgery 3rd ed. Elsevier — green iguana medicine, kidney disease pathophysiology, common diseases of captive iguanas, surgical interventions
- ARAV (Association of Reptile and Amphibian Veterinarians) — clinical guidelines on green iguana husbandry, UV-B protocols, dietary recommendations, early MBD detection
- LafeberVet exotic pet care references — green iguana diet (80/15/5 framework), enclosure size recommendations, husbandry checklist
- CITES Appendix II listing — legal status of Iguana iguana, ethical sourcing considerations
- IUCN Red List + invasive species literature — green iguana status in its natural habitat vs invasive populations
This article is general guidance based on international reptile husbandry and exotic medicine principles. For your iguana's specific condition — including signs of a soft jaw, weak legs, anorexia, or abdominal swelling — a consultation with an exotic vet is the right step.
