Green Iguana: Health, Temperament, Care & Costs

Green iguanas are large, tree-dwelling herbivorous lizards native to Central and South America and parts of the Caribbean. Adults commonly reach 4 to 6 feet in total length, with much of that length coming from the tail, and they need far more room than many pet parents expect. With appropriate care, many live 10 to 15 years, and some live longer. That long lifespan, plus their adult size, makes them a serious long-term commitment rather than an easy beginner reptile.

Temperament varies. Some green iguanas become calm with slow, consistent handling, while others remain defensive, especially during breeding season, shedding, illness, or stressful enclosure changes. They can scratch with sharp claws, whip with the tail, and bite if frightened. A green iguana usually does best with a pet parent who can read body language, provide daily husbandry, and work closely with your vet if appetite, mobility, or shedding changes.

Their care centers on space, heat, humidity, and UVB lighting. Merck lists green iguanas as arboreal rainforest reptiles that need a preferred optimal temperature zone around 84 to 91 F and humidity around 60% to 85%. UVB exposure is essential because it helps them make vitamin D3 and absorb calcium. When those basics are off, health problems can develop slowly and become severe before a pet parent notices them.

The most common preventable problem in pet green iguanas is metabolic bone disease (MBD). This usually develops when UVB lighting, calcium intake, temperature, or overall diet is not appropriate. Early signs may be subtle, such as weakness, reduced climbing, tremors, a softer jaw, or decreased appetite. As disease progresses, fractures, limb deformities, and severe pain can occur. VCA and PetMD both note that MBD is one of the most common illnesses seen in pet reptiles and iguanas.

Green iguanas can also develop infectious stomatitis (mouth rot), respiratory disease, skin infections, parasites, kidney disease, bladder stones, abscesses, and reproductive problems such as egg binding or follicular stasis in females. Retained shed, swollen limbs, bloating, open-mouth breathing, mouth discoloration, and trouble using the legs all deserve prompt veterinary attention. Because reptiles often hide illness, a green iguana that seems quieter, thinner, or less interested in food may already be significantly unwell.

There is also a human health consideration. Like other reptiles, green iguanas can carry Salmonella even when they look healthy. Good handwashing after handling the iguana, dishes, décor, or enclosure surfaces matters. Homes with very young children, older adults, pregnant people, or anyone who is immunocompromised should discuss reptile-related hygiene risks with their physician and your vet.

A green iguana may have a modest purchase or adoption cost, but the setup and ongoing care are where the real commitment shows. In the US, a juvenile may cost roughly $50 to $200, while rescue or rehoming fees are often lower. The larger expense is creating an adult-appropriate environment with climbing space, heat, humidity control, sturdy furnishings, and quality UVB lighting. A realistic initial setup for a growing iguana often lands around $600 to $2,000+, and custom adult housing can push that higher.

Monthly care commonly includes fresh greens and vegetables, supplements, replacement bulbs, substrate or enclosure liners, cleaning supplies, and electricity for heating and lighting. Many pet parents spend about $60 to $150 per month on routine care, though large custom enclosures and higher utility use can raise that total. UVB bulbs need scheduled replacement even if they still produce visible light.

Veterinary care should be part of the budget from the start. A new-patient or annual exotic wellness visit in many US clinics is often $90 to $250, with fecal testing commonly adding $30 to $80. Diagnostics such as radiographs or bloodwork may add $150 to $400+, and treatment for MBD, egg binding, stones, or surgery can move into the hundreds to low thousands of dollars depending on severity. For many families, the most realistic way to plan is to think in terms of a yearly care budget rather than the animal's upfront cost alone.

Green iguanas are herbivores, not omnivores. Their diet should be built around dark leafy greens and other vegetables, with fruit used sparingly. PetMD recommends leafy greens as the mainstay of the diet, with other vegetables in smaller amounts and fruit in limited quantities. Good staple greens often include collard greens, mustard greens, turnip greens, dandelion greens, and escarole. Squash, green beans, and similar vegetables can add variety.

A practical target is to make most of the bowl leafy greens, add a smaller portion of mixed vegetables, and keep fruit as an occasional topper rather than a daily base. Food should be chopped into bite-sized pieces because iguanas swallow rather than chew thoroughly. Fresh water should always be available, and uneaten produce should be removed before it spoils.

Calcium balance matters as much as ingredient choice. Green iguanas need appropriate UVB exposure, heat, and calcium supplementation to use dietary calcium well. Over-supplementing can also cause problems, so supplement plans should match the enclosure setup, age, and health status. Dog food, cat food, and high-protein animal-based diets are not appropriate routine foods for green iguanas and may contribute to serious health issues.

Green iguanas are active climbers that need vertical space more than floor space alone. They do best in tall enclosures with sturdy branches, shelves, ramps, and basking areas that let them move between warmer and cooler zones. An iguana that cannot climb, stretch out, thermoregulate, and choose different perches is more likely to become stressed, weak, or obese.

Daily activity is usually driven by husbandry. Proper heat and lighting encourage basking, feeding, and movement during the day. Safe supervised time outside the enclosure may help some iguanas stay active, but it should only happen in a secure, escape-proof area and at temperatures appropriate for the species. VCA notes that supervised direct sunlight can be beneficial when outdoor temperatures are above 80 F, but the iguana still needs access to shade.

Handling is not the same as exercise. Some green iguanas tolerate gentle interaction, but many become defensive if restrained too often or approached quickly. Watch for stress signals such as tail whipping, dewlap extension, body inflation, head bobbing, or attempts to flee. Calm, predictable routines usually work better than frequent forced handling.

Preventive care for a green iguana starts with husbandry. The enclosure should provide appropriate heat, humidity, climbing structure, and direct access to a quality UVB source for about 10 to 12 hours daily. VCA notes that UVB should reach the iguana without glass or plastic blocking it, and many bulbs need replacement about every six months or according to manufacturer guidance. These details matter because many reptile illnesses begin with small husbandry gaps.

Plan on a baseline exam soon after bringing your iguana home and then regular wellness visits with your vet. VCA recommends annual health examinations and fecal parasite checks for iguanas. Routine visits can help catch weight loss, early bone changes, oral disease, parasites, reproductive issues, and kidney concerns before they become emergencies.

At home, monitor appetite, stool output, climbing ability, shedding, jaw firmness, body condition, and behavior. Keep the enclosure clean, wash hands after contact, and disinfect food and water dishes regularly. If your iguana shows weakness, swelling, open-mouth breathing, bloating, or a sudden drop in appetite, contact your vet promptly. Reptiles often hide illness until they are quite sick, so early action can make a major difference.