The Chahoua Gecko is an arboreal gecko native to the forests of New Caledonia, distinguished by its mottled pattern that blends with tree bark and moss, a strong prehensile tail, and a relatively robust build. This document covers wild natural history, classification, and conservation; standards for captive temperature, humidity, feeding, and equipment are addressed in a separate husbandry guide.

1. Classification and Naming

The Chahoua gecko Mniarogekko chahoua belongs to the family Diplodactylidae within the order Squamata and infraorder Gekkota.

It was first described in 1869 by the French pharmacist and naturalist Arthur Bavay, based on specimens from New Caledonia.

Its original combination was Platydactylus chahoua and after undergoing various taxonomic reclassifications, it was known for a long time as Rhacodactylus chahoua.

The specific epithet chahoua The name is known to originate from a local New Caledonian language, and early literature cites Bavay’s explanation of its meaning.

The genus name Mniarogekko The name combines a root word evoking an appearance resembling a mossy covering with “gecko,” effectively highlighting the species’ unique camouflage pattern.

In most 20th-century literature, it was treated—along with the Crested gecko, Gargoyle gecko, and *Rhacodactylus leachianus*—as a member of the broadly defined genus Rhacodactylus.

A 2012 molecular phylogenetic re-evaluation by Bauer, Jackman, Sadlier, and Whitaker provided the basis for reorganizing this traditionally large genus into several independent lineages.

As a result, the Crested gecko lineage Correlophus, the Chahoua gecko lineage Mniarogekko, and the *leachianus* lineage were classified within the narrow sense of Rhacodactylus.

The Chahoua gecko is a representative species of the newly defined Mniarogekko genus, and a closely related species was also covered Mniarogekko jalu in the same study.

M. jalu It is morphologically very similar to the Chahoua gecko, but its distribution is skewed further north, and its known range is limited.

In the pet trade, the Grande Terre (main island) and Île des Pins lineages are often distinguished as “Mainland” and “Pine” localities.

Common English names include “Mossy prehensile-tailed gecko” and “Short-snouted New Caledonian gecko,” in addition to “Chahoua gecko.”

2. Distribution and Habitat

The Chahoua gecko is an endemic species found naturally only in New Caledonia, a French territory in the southwestern Pacific.

Its primary distribution is known to be scattered across the lowland and foothill forests of the central and southern regions of the main island, Grande Terre.

Historical records document its presence at various locations, including the areas around Canala, the Amoa Valley, Sarraméa, La Foa, and Mont Koghis.

The Chahoua gecko is also known to inhabit Île des Pins, south of Grande Terre; within the captive-breeding community, the lineage from this island is strongly distinguished as a separate locality.

Distribution records are concentrated primarily in forests at relatively low elevations; lowland rainforests and wooded areas at the base of mountains are more important than alpine zones.

Although arboreal, this species does not restrict itself to the highest forest canopy; it makes extensive use of trunks, lower branches, vines, and crevices in the bark.

On rough bark covered with moss and lichens, its mottled coloration blends with the background, providing highly effective camouflage.

Lowland forests are vulnerable to both human activity and introduced species; consequently, qualitative changes in habitat—not just a reduction in total area—pose a significant threat.

Mining, logging, agriculture, and urban expansion have been identified as factors fragmenting the forests inhabited by various endemic reptiles in New Caledonia.

While some known habitats overlap with protected areas, not all local populations enjoy the same level of protection.

Most Chahoua geckos currently found in the international pet trade come from long-established captive-bred lineages, as the capture and export of wild specimens from New Caledonia are subject to strict regulations.

3. Morphology and Body Structure

The short-snouted gecko is among the larger and more robust of New Caledonia’s arboreal geckos.

The snout-to-vent length (SVL) of adults can reach approximately 147 mm in large individuals, and the total length—including the tail—often ranges from 25 to 30 cm.

Its body appears heavier and broader than that of the Crested gecko, and its head has a short, wide, triangular profile.

The common name “short-snouted” reflects this head shape, characterized by a relatively short and blunt-looking snout.

Its large eyes are adapted for nocturnal activity, featuring vertically elongated pupils that expand and contract significantly depending on light levels.

The skin has a smooth, somewhat velvety texture and can display a complex mix of greenish-brown, grayish-brown, reddish-brown, and pinkish hues, along with white spots.

In particular, the irregular blotches on the back and flanks mimic the colors of moss, lichens, and tree bark, helping to obscure the animal’s outline when it is stationary.

Its toes feature the specialized microscopic adhesive structures typical of geckos, enabling it to climb vertical bark, leaves, and branches.

The tail is muscular and strongly prehensile, functioning like a ‘fifth hand’ that wraps around branches to provide stability.

It can shed its tail when threatened, and unlike the Crested gecko, the Chahoua gecko is capable of tail regeneration.

Although the regenerated tail may not perfectly match the original in terms of pattern and scale structure, it is still used for balance and gripping.

The physical build and coloration trends associated with the “Mainland Pine” locality in the hobby are important commercial characteristics, but they should not be equated with taxonomic species or subspecies.

4. Ecology and Behavior

The Chahoua gecko is an arboreal gecko that is crepuscular and nocturnal, showing increased activity after sunset.

During the day, it rests in places that offer shelter from light and predators, such as crevices in tree bark, shaded areas where leaves and branches overlap, or hollow stems.

At night, it moves between trunks and branches to forage, using both its strong feet and prehensile tail to stabilize its posture on vertical structures.

Compared to other large New Caledonian geckos, it is known to utilize the lower and middle layers of the forest extensively, rather than strictly adhering to the high canopy.

They generally live as solitary individuals; territorial competition and aggressive interactions may occur, particularly among adult males.

Vocalizations, alongside visual signals such as body posture, tail movements, and approach or avoidance behaviors, are used for communication between individuals.

Its cryptic coloration—which makes it nearly indistinguishable from tree bark—serves as a primary defense when stationary; if detected, the gecko typically responds with rapid movement and concealment behind the bark.

Although capable of autotomy (tail shedding), the tail is crucial for everyday movement and balance, so it cannot be viewed merely as a disposable defensive organ.

“Direct, long-term behavioral studies on wild populations remain limited compared to those on Crested geckos or other widely studied captive species.

Introduced rodents in New Caledonia’s forests are cited as a significant potential source of predatory pressure on the *Chaoua* gecko, as they can climb trees and prey on eggs and juvenile reptiles.

The invasive little fire ant (Wasmannia auropunctata) and feral cats are also identified as introduced species that adversely affect native lizard communities in New Caledonia.

5. Diet and Feeding Habits

The Crested gecko is an omnivorous gecko that utilizes both animal prey and plant resources in the wild.

Insects and other small invertebrates serve as vital sources of protein; when active prey is detected, the gecko approaches and captures it over a short distance.

The proportion of animal prey in their diet is not fixed, as the types and abundance of arthropods available in the forest fluctuate with the seasons.

During the fruiting season, they lick up soft pulp and juices, and also opportunistically consume sugary resources found in flowers.

When fruit is scarce, their reliance on insects and other small animal prey may increase significantly.

Their large mouths and relatively strong jaws provide a morphological advantage for handling arthropods of various sizes.

While there are records of opportunistic predation on small lizards or other small vertebrates, these do not constitute the bulk of their daily diet.

Hydration needs can be met not only through the bodily fluids of prey but also by consuming water droplets remaining on leaves and stems after rain or dew.

This strategy of utilizing both plant- and animal-based food sources allows for the exploitation of diverse resources within the highly variable environments of tropical islands.

Specific details regarding complete captive diets, insect feeding ratios, supplements, and feeding schedules are matters of husbandry practice distinct from natural dietary habits and are therefore not covered in this document.

6. Reproduction

The Chahoua gecko is an oviparous reptile.

Females typically produce two eggs per clutch.

After laying, the two eggs often harden while touching, appearing as a single pair—a characteristic frequently noted in captive breeding records.

Rather than laying eggs in fully exposed areas, they select relatively stable microhabitats, such as behind tree bark, in crevices, or within the substrate.

Some observations indicate that females remain near the nesting site; consequently, their spatial behavior following egg-laying warrants further study.

During the breeding season, multiple clutches may be produced, requiring a significant investment of energy and minerals from the female.

The rate of egg development is influenced by environmental conditions such as temperature and humidity, and the time required for hatching can vary significantly depending on these conditions.

While a hatching period of roughly two to three months is commonly cited in captive breeding records, data regarding the microenvironments of wild nests remain relatively scarce.

Male territorial behavior and individual recognition are likely linked to the processes of finding mates and competing with rivals.

Upon hatching, the young begin to seek shelter and forage independently, without long-term provisioning or direct parental care.

The age of sexual maturity and the interval between egg-laying events can vary based on growth rates and environmental conditions; therefore, figures derived from captive populations should not be directly applied to wild populations.

7. Conservation Status and Threats

The Chahoua gecko is a reptile endemic to New Caledonia that is classified as Vulnerable by the International Union for Conservation of Nature (IUCN).

The primary risk factor is that it is not a species widely distributed across the globe, but rather one that relies on a limited island environment and a relatively narrow distribution range.

The degradation and fragmentation of lowland forests can reduce the availability of shelter, food, and egg-laying sites, thereby diminishing habitat quality.

Development activities—including nickel mining—along with the expansion of roads and agricultural land, have exerted long-term land-use pressure on New Caledonia’s unique biodiversity.

Introduced rodents pose a particular threat to the island’s arboreal reptiles, as they can climb trees to prey on eggs and young lizards.

Invasive ants, such as the little fire ant, have been identified as a threat capable of disrupting the activity and foraging of native lizards, as well as causing them direct harm.

Feral cats and other introduced predators can also exert additional predatory pressure on both adult and juvenile individuals in certain areas.

Although the Chahoua gecko is not currently listed in the CITES appendices, this does not mean that wild individuals can be freely captured or exported.

Local environmental regulations in New Caledonia strictly restrict the capture, transport, and trade of native wildlife; removing wild individuals legally requires a local permit.

Captive-bred populations of Chahoua geckos exist within the global pet trade, playing a crucial role in decoupling the demand for pets from the harvesting of wild individuals.

However, the existence of captive populations does not substitute for the conservation of wild habitats; long-term monitoring of natural populations—specifically regarding their distinct localities and genetic diversity—remains necessary.

The key to Chahoua gecko conservation lies in preserving lowland forests, mitigating pressure from invasive species, and tracking population changes over the long term within their limited distribution range.

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References

1. Bavay, A. (1869). Catalogue des Reptiles de la Nouvelle-Calédonie et description d’espèces nouvelles. Mémoires de la Société Linnéenne de Normandie 15, 1–37.
2. Bauer, A.M., Jackman, T.R., Sadlier, R.A. & Whitaker, A.H. (2012). Revision of the giant geckos of New Caledonia. Zootaxa 3404(1), 1–52. DOI: 10.11646/zootaxa.3404.1.1
3. The Reptile Database. Mniarogekko chahoua (Bavay, 1869).
4. Endemia.nc. Mniarogekko chahoua.
5. CITES Appendices I, II and III.

Image Principles: The 14 images across the seven sections are separate files. No photos of other gecko species were used. For sections where photos of the *Rhacodactylus auriculatus* (Gargoyle gecko) itself were unavailable—such as ecology, diet, reproduction, and conservation—images of its local New Caledonian habitat and data directly related to its environment and threats were used; any image not depicting the actual species is clearly identified in the caption.