The Leachianus is the largest living gecko, a massive, vocal arboreal species from New Caledonia. It is long-lived and hardy but known for territorial aggression, so it is almost always kept singly.
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Up to 14 in (36 cm) total length; the world's largest living gecko, heavy and robust
Lifespan
20–30 years
Social needs
solo
Native region
New Caledonia and surrounding islets, South Pacific
Origin
Old World
Climate
⛅ Subtropical
Family
Diplodactylidae
Genus
Rhacodactylus
Part of the Geckos
Geckos range from desert ground-dwellers to humid cave and forest specialists; eyelid geckos like Goniurosaurus and leopard geckos have movable eyelids and are largely terrestrial.
From the minimum an animal needs to be kept humanely, up to the ideal setup. Bigger is almost always better — minimums are floors, not targets.
Photo coming soon
Minimum
Large arboreal terrarium
24 × 18 × 36 in
Rhacodactylus leachianus is the world's largest gecko. A single adult needs at least a 24×18×36 vertical with thick cork rounds, dense foliage, and ambient 22–26 °C. Solitary — never co-house adults.
Photo coming soon
Recommended
Tall planted vivarium
36 × 18 × 48 in
A 36×18×48 vertical with multiple thick cork hides (they wedge into cavities), branches, and broad-leaf plants. Low UVB. Mist nightly to 70–80%.
Photo coming soon
Ideal
Bioactive arboreal giant
48 × 24 × 60 in, bioactive
Large bioactive New Caledonian forest enclosure with massive cork structures, live tropical plants, and full vertical climbing. Lets this slow, deliberate gecko express full ranging behaviour.
Life & growth stages
How this animal changes through its life — each stage often has its own care, diet and space needs.
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Egg / Neonate
Most reptiles lay leathery- or hard-shelled eggs incubated by ambient warmth, though some snakes and lizards give live birth. Incubation temperature can influence sex and development in many species.
Photo coming soon
Hatchling
Hatchlings emerge as fully formed miniatures of the adult, often using an egg tooth to slit the shell. They are independent from birth but small and vulnerable, and may show brighter or different juvenile patterning.
Photo coming soon
Juvenile
Juveniles grow steadily, shedding their skin periodically as they enlarge. Coloration and proportions shift toward the adult form, and growth rate depends heavily on temperature, diet, and basking/UVB access.
Adult
Adults reach the species' full length and mass and become sexually mature. Many reptiles show sex differences in size, coloration, or features (such as larger heads, hemipenal bulges, or femoral pores), and continue to shed throughout life.
Color & pattern variants
Natural variants occur in the wild; selectively bred (man-made) variants were developed in captivity.
Natural
representative
Grande Terre (mainland) type
Largest forms, sometimes exceeding 13-14 in; mottled gray, green, and brown with variable banding.
representative
Island locality types (e.g., Pine Isle, Nuu Ami, Bayonnaise)
Smaller island populations with distinctive size and color/pattern traits prized by keepers; lineage documentation is important.
Habitat & enclosure
Arboreal; a single adult needs a vertically oriented enclosure of at least 18x18x36 in (45x45x90 cm), with larger giants benefiting from 24x24x36 in or more. Provide thick cork rounds and branches plus a hide they can wedge into. Keep daytime temps 72-80°F (22-27°C) with a night drop; they dislike sustained heat above the mid-80s°F (~29°C). Maintain humidity around 50-70% with evening misting and good ventilation.
Substrate
A bioactive coco fiber, orchid bark, and sphagnum blend holds humidity and supports cleanup crews and plants. Paper towel suits quarantine. Keep the substrate moist but well-drained to avoid mold and respiratory issues.
Equipment & setup
High heat is unnecessary; supplemental low-wattage heat only if the room is cool. Low-level UVB is optional but beneficial. Use a misting system or sprayer, reliable thermometer/hygrometer, and very secure, heavy climbing structures to support their bulk.
Diet
Omnivorous, with a strong appetite. Feed a complete powdered crested-gecko-type diet (Pangea, Repashy) as a staple, supplemented with gut-loaded, calcium-dusted insects and occasional fruit. Adults may take the occasional appropriately sized pinky mouse but this is not required and should be infrequent. Provide calcium and a multivitamin on a rotating schedule.
Behavior & temperament
Intelligent and individual in personality; some tolerate handling while many are defensive and will growl, bark, lunge, and deliver a powerful, sometimes injurious bite. Highly territorial — adults must be housed alone unless an experienced breeder is deliberately and carefully introducing a compatible pair. Mostly nocturnal and very vocal.
Health
Generally robust and exceptionally long-lived. Watch for metabolic bone disease from poor supplementation, obesity from overfeeding, retained shed, and stress or injury from cohabitation attempts. Quarantine new arrivals and run periodic fecal exams.
Tips, DIY & hacks
Numerous documented locality types and lines exist (e.g., GT-mainland forms and various island localities such as Nuu Ami, Pine Isle, Yate, Bayonnaise), differing in size and pattern — keep lineage records. Respect their space; let new animals settle for weeks before handling, and always support their full weight.
