Cyclura Lewisi Hybrid Care Guide

Housing Lighting Temperature Diet Behavior and Long Term Care

Written by Sam Pascucci
Florida Iguana and Tortoise Breeders Sam’s Giant Tortoise Farm
First review draft October 2026

This guide is written for customers raising lewisi influenced Cyclura hybrids. It combines the practical methods we use at our South Florida breeding facility with the specific housing, feeding, lighting and seasonal-management details that matter in day-to-day care. These iguanas can live for many decades, grow into powerful adults and require long-term planning from the beginning.

Quick Care Summary

What These Iguanas Are

The Grand Cayman blue iguana, Cyclura lewisi, is native to Grand Cayman. Individuals can exceed 25 pounds, and their striking blue color, heavy build and intelligence have made them one of the best-known rock iguanas.

The animals commonly called “lewisi” in the private United States pet trade are lewisi influenced Cyclura hybrids, not pure Grand Cayman blue iguanas. This guide therefore uses the term lewisi hybrid. It does not attempt to explain our separate bloodline-grading system or assign a purity percentage to an individual animal.

Our breeding stock traces back to animals established in the 1970s. For decades, Florida Iguana and Tortoise Breeders has selected for strong lewisi characteristics, blue coloration, sound structure, good temperament and dependable genetics. These are long-lived animals. Thirty to forty years is not unusual, and I have personally owned lewisi type iguanas that lived for more than 60 years.

Historical phylogeographic map of Cyclura showing Grand Cayman and neighboring island populations.

Housing and Enclosure Design

Cyclura are ground iguanas. They may climb and use elevated shelves or logs, but usable floor area is the starting point for enclosure planning. Provide rocks, logs, solid resting surfaces, visual barriers, shade and hiding places. Enclosures must allow the animal to move between warmer and cooler zones.

Small Indoor Enclosures

A 20 gallon long aquarium can be sufficient for a single hatchling for approximately the first 6 to 12 months. A better starting setup has at least 30 by 24 inches of floor space. That area can work for two iguanas measuring about 10 to 16 inches each, but only during the first year. After that, increase the enclosure according to the animals’ actual size, strength and activity.

Hatchlings and juveniles should be kept on a substrate that can be cleaned and monitored. Newspaper, paper towels, indoor outdoor carpet and reptile carpet are useful indoor choices. Dirt or a dirt and sand mixture can be used where sanitation can be maintained, but loose material requires closer observation because it may be swallowed with food. Adult outdoor enclosures can use natural dirt, sand, rocks, plants and sturdy tree limbs.

Small Outdoor Wire Enclosures

One practical design is a fully wire enclosure measuring approximately 36 by 24 by 30 inches high, although it can be made larger. We use ½ by 1 inch wire and prefer PVC-coated wire because its smoother surface helps prevent nose abrasion. Keep the enclosure depth within easy reach so the animal can be retrieved if necessary.

• Provide shade cloth over the top.
• Cover approximately 70 percent of the bottom with clear plastic carpet runner or another cleanable solid surface, leaving appropriate drainage and natural exposure.
• Use a secure loop-lock or push-to-open bird-cage style door only if it cannot be opened accidentally by the animal.
• Check all wire ends, seams and fasteners for sharp points.

Large Outdoor Enclosures for Subadults and Adults

Large outdoor cages may be built with 4 by 4 posts and 2 by 4 framing. A typical starting adult enclosure is approximately 4 feet wide by 8 feet long by 6 feet high. At our farm, we commonly use enclosures 8 feet wide by 12 or 16 feet long and 6 feet high. More usable space is beneficial when the layout and security remain sound.

The walls may be constructed from ½ by 1 inch mesh or, for full-grown adults, 1 by 1 inch mesh. PVC-coated wire is preferred where practical. Enclosures can also be built with all-aluminum framing.

Doors require a dependable locking mechanism plus a secondary security S hook. On walk-in cages, install an interior pull wire or release so a person cannot become locked inside.

Commercially Available Enclosure Examples

Commercial enclosures may provide a useful starting point, but dimensions, wire strength, weather resistance, ventilation, shade and escape security must be evaluated for the iguana’s present size. Most prefabricated units are not permanent adult housing.

• Aivituvin AIR18 wooden reptile enclosure: https://aivituvin.com/collections/reptile-habitat/products/aivituvin-large-wood-reptile-cages-air18
• Aivituvin AIR22 tall enclosure: https://aivituvin.com/collections/cat-house/products/cat-house-air22-inner-space-6-25ft
• Aivituvin AIR37 extra-large walk-in enclosure: https://aivituvin.com/collections/reptile-habitat/products/aivituvin-air37-extra-large-enclosure-for-chameleon-lizards-iguanas

Pairing Adults and Introducing a New Iguana

Never place a newly acquired adult directly into an established adult’s enclosure. An iguana housed alone may defend its territory, and a fight can cause devastating injuries. Initial separation, health assessment, adjacent housing and closely supervised introductions are necessary. The full introduction and breeding-pair protocol will be covered in a separate guide; this care sheet does not replace that procedure.

Lighting Temperature and Humidity

Ultraviolet Light

Natural sunlight is the best source of ultraviolet light when the animal also has shade and cannot overheat. Indoor Cyclura require 10 to 14 hours of appropriate UVB exposure each day. UVB enables vitamin D3 production, which is necessary for calcium metabolism and normal bone development. Poor UVB exposure and improper nutrition can cause metabolic bone disease.

The useful output of a lamp cannot be judged by visible brightness or by age alone. Measure the UVB at the iguana’s actual body and basking level. Screens, mesh, distance, reflector design, plants and cage furnishings can greatly reduce the amount reaching the animal.

When using a Solarmeter 6.2, UVB should read at least 50 µW/cm² at the basking level. We generally prefer approximately 75 to 100 µW/cm² for indoor hatchlings and juveniles, with lower-UV and fully shaded areas available. A Solarmeter 6.5 measures UV Index on a different scale; do not apply the 50 to 100 figures to that meter.

Replace a UVB lamp according to measured output and the manufacturer’s guidance, not only according to a calendar. A lamp that still produces visible light may no longer provide adequate UVB.

Heat and Thermal Gradient

A one-bulb system may use an appropriate mercury-vapor reptile lamp. A two-bulb system uses a dedicated UVB source with a separate basking lamp. Mount and guard every lamp so the iguana cannot touch it.

For hatchlings and juveniles, maintain daytime ambient temperatures generally between 86 and 96°F and provide a basking area near 100°F. Adults may bask at temperatures approaching 105°F. Measure the animal’s body-level temperature and adjust the lamp height so the iguana does not exceed 105°F or suffer a thermal burn. Night temperatures can generally fall to 75 to 80°F.

The cage must contain a true thermal gradient. Place the basking lamp at one end so the animal can move away from the heat. Depending upon the enclosure and season, the usable range may extend from approximately 100°F at the warm end to about 68°F at the coolest retreat. Humidity may range from approximately 40 to 75 percent, but ventilation, hydration and access to dry resting areas remain important.

Outdoor Cold Weather Management

Every outdoor adult enclosure at our farm has a heated hut controlled by a thermostat. We also monitor the hut with temperature sensors and use additional safety equipment appropriate to the heating system.

When outdoor temperatures fall below 55°F, we secure the iguanas inside their heated huts. If the daytime temperature reaches only 60 to 62°F and colder weather is expected that night, we do not feed. We also avoid feeding whenever temperatures are expected to fall below 70°F before the animal has had adequate heat and time to digest the meal.

Cyclura depend on body heat for normal gastrointestinal movement. Digestion and peristalsis slow markedly as body temperature falls; in our husbandry experience, the reduction is substantial around and below 70°F. Food, particularly sugary food, may remain in the digestive tract and ferment. This can cause bloat—a visibly enlarged, tight, gas-filled abdomen. Preventing the problem is safer than feeding on an unsuitable day.

Building the PVC Heated Iguana Hut

Customers frequently ask about the heated iguana houses we build at our farm. PVC construction has been one of our best improvements. Wood houses exposed to South Florida weather may deteriorate and need replacement, while PVC is easy to wash, does not rot and stays in good condition for many years. We avoid unnecessary metal hinges and latches where a PVC construction method can be used because outdoor metal hardware can rust or fail.

One of our South Florida PVC iguana huts in an outdoor enclosure. The sloped roof also provides a basking surface, while the front opening gives the iguana access to the protected interior.

We build the huts from ½ inch PVC trim sheet sold in 4 by 8 foot panels. The material used in our written farm instructions is a white reversible PVC trim sheet: https://www.homedepot.com/p/1-2-in-x-48-in-x-8-ft-White-Reversible-PVC-Trim-Sheet-H120AWS6/205309788

For one adult Cyclura, 30 by 30 by 30 inches is the absolute minimum hut size. I prefer approximately 40 inches wide by 30 inches deep by 36 inches high. Our standard farm huts are generally 48 inches wide by 30 inches deep by 36 inches high. Adequate height is important because the heating equipment must remain safely separated from the iguana.

A standard hut is divided into an upper heating compartment and a lower animal compartment with strong wire mesh between them. We normally mount two 75 watt ceramic heat emitters in the upper compartment and angle them downward. The mesh prevents the iguana from touching the hot emitters. Ceramic emitters provide heat without producing light.

We control the heaters with a thermostat rather than a dimmer. Our thermostat shuts the heat off when the temperature rises above approximately 55°F, and we aim to maintain an internal range of approximately 60 to 80°F during cold weather. The thermostat used in our written farm instructions is the EvenTherm TH5 20: https://www.qcsupply.com/products/eventherm-th5-20-thermostat

The ceramic heater model referenced in our farm instructions is: https://www.amazon.com/dp/B096TTB7B3. Products and listings can change, so match the electrical rating, ceramic socket, clearances and protective arrangement shown in the design rather than relying only on a product name.

We do not insulate these huts in South Florida. With our heating arrangement, they have performed well on nights down to approximately 39°F. In a colder region where temperatures may fall below 40°F, consider insulation or a double-wall design and verify performance with temperature sensors before depending upon the hut during severe weather.

Our enclosure system also includes remote temperature monitoring, and the heating installation must be protected from water, chewing, direct animal contact and accidental movement. Outdoor electrical work should use correctly rated components and safe wiring methods.

PVC iguana hut construction videos:

• PVC Iguana Hut Design Part One: https://www.youtube.com/watch?v=DBNG4mOiSgk
• PVC Iguana Hut Design Part Two: https://www.youtube.com/watch?v=hp6PUfoxVaQ

Water and Calcium

Provide fresh water every day in a shallow, stable container that cannot trap a hatchling. Clean and refill it whenever it becomes contaminated.

Indoor hatchlings and juveniles need a properly designed UVB program and a balanced source of dietary calcium. At our farm, a reptile calcium product containing vitamin D3 may be used approximately once a week for indoor babies and hatchlings. Supplementation must not be used to compensate for inadequate UVB, poor temperature control or an unbalanced diet.

Diet and Feeding

Cyclura are herbivorous iguanas. At our farm, we strictly avoid routine animal protein. We do not feed meat, eggs, insects, dog food or cat food. A varied plant-based diet and a properly formulated tortoise diet provide what captive animals require.

Fresh Produce

Our regular greens include romaine lettuce, escarole, Bibb lettuce, green leaf lettuce and red leaf lettuce. Escarole is especially useful because it is a good food, readily available and economical when feeding a large collection. Additional variety may include endive, dandelion greens, mustard greens, turnip greens, collard greens, watercress, bok choy and moderate amounts of kale.

Vegetables can include grated green and yellow squash, winter squash, green beans, carrots, parsnips and sweet potato. Rotate foods instead of relying upon one item. Iceberg lettuce has little nutritional value and should not be a regular food.

Fruit should make up no more than 5 percent of the total diet. Small amounts may include banana, grape, apple, pear, cantaloupe, honeydew, strawberry, cherry tomato or another suitable seasonal fruit.

Mazuri Tortoise Diet 5M21

Mazuri Tortoise Diet 5M21 is a regular part of our feeding program, not merely a supplement. Under normal warm-weather conditions, we aim to feed about five days each week: fresh produce on three or four days and Mazuri 5M21 on two days. We do not mix the chow with produce. One feeding day is produce; another feeding day is chow.

Weather Determines Whether We Feed

A five-day schedule is a goal, not an instruction to feed regardless of conditions. We do not feed on an all-day cool rain or when the animal cannot warm sufficiently. During unsuitable South Florida weather or winter cold, an outdoor Cyclura may miss four, five or even six feeding days. A healthy adult is safer missing meals than receiving food it cannot digest properly.

Bread Is Not a Regular Food

Bread is not part of the normal diet. At our farm, a small amount may be used only a few times a year as a practical carrier for prescribed medication, because many Cyclura accept it readily. This limited medical use should not be interpreted as permission to add bread to routine meals.

Sanitation

Remove feces and uneaten food promptly. Wash food and water bowls regularly, and clean huts, branches, perches and other surfaces whenever contaminated. Remove visible waste and organic matter before applying disinfectant.

At our farm, we use a properly diluted chlorine-bleach solution for food and water bowls, heated huts, branches and other hard surfaces. Allow appropriate contact time for the product being used, rinse every surface thoroughly with fresh water and allow it to dry completely before returning the iguana or replacing food and water. Never mix chlorine bleach with ammonia, acids or other cleaners.

Behavior Taming and Safe Handling

Regular calm interaction helps a young iguana become accustomed to people and its surroundings. Work at the animal’s pace and avoid chasing it repeatedly around the enclosure. Never pick up an iguana by the tail; the tail can break or be injured.

Adult Cyclura are exceptionally strong and can bite, scratch or strike with the tail. Even an animal that normally appears tame can react quickly. Keep faces and fingers away from the mouth, supervise children closely and never place a child in an enclosure with an unsecured adult.

Males may become more territorial during breeding season. Females can become highly defensive after laying eggs and while guarding a nest. Individual temperament varies, and our breeding program has long selected for manageable behavior as well as appearance and genetics.

Health and Parasite Monitoring

Parasite monitoring should reflect the animal’s actual exposure. An owner keeping only one or two healthy iguanas, with no contact with additional reptiles, generally has a much lower risk of introducing parasites. For these animals, having a fecal sample checked approximately once a year is a reasonable precaution.

Breeders and keepers with larger collections have greater exposure risks, particularly when new animals are introduced. In these situations, we recommend fecal parasite examinations as often as every six months. A new animal should be kept physically separate from the established collection while its health and parasite status are evaluated.

At our facility, Panacur has traditionally been used as part of our parasite-control program, generally once a year. Medication is not a substitute for testing. The correct treatment and dosage depend upon the iguana’s weight, condition and the parasite involved, and should be determined with an experienced reptile veterinarian or other appropriately qualified professional.

Seek qualified help promptly for persistent loss of appetite under proper temperatures, marked weight loss, weakness, inability to use a limb normally, jaw or limb deformity, repeated vomiting or regurgitation, severe diarrhea, blood in the stool, respiratory distress, significant trauma or a tight, gas-filled abdomen.

Long Term Responsibility

A lewisi hybrid is not a short-term pet. Before purchasing one, plan for the adult enclosure, secure doors, heating, shade, seasonal weather, backup power and safe handling. The animal may remain in the family for several decades. Good care depends upon observing the individual iguana and adjusting the enclosure and routine as it grows.

Scope of This Guide

This first revision is a care guide. It intentionally does not include our detailed lewisi bloodline-grading system or the complete procedure for introducing unfamiliar adults and establishing a breeding pair. Those subjects require separate articles so the safety steps and genetic terminology can be explained fully.