Leachianus Gecko Care Sheet

A complete guide to the world’s largest gecko

Quick Summary

Introduction

The Leachianus gecko (Rhacodactylus leachianus), often referred to as the “leachie,” is the largest living species of gecko and one of the most fascinating reptiles available in the hobby. Native to the islands of New Caledonia, these arboreal geckos are known for their impressive size, bark-like camouflage, and unique personalities.

Unlike many smaller gecko species, leachies are not typically suited for frequent handling. Instead, they are best appreciated as display animals, where their natural behaviours and nocturnal activity can be observed. With proper care, they can live for decades and become a long-term, rewarding commitment for dedicated keepers.

Natural Habitat

Leachianus geckos originate from the humid forests of New Caledonia, where they inhabit trees, often sheltering in hollows and dense vegetation. The climate in this region is relatively stable, with moderate temperatures, high humidity, and good airflow.

Replicating these environmental conditions in captivity is essential for their long-term health and wellbeing.

Enclosure Requirements

Size and Space

Due to their size and arboreal nature, leachianus geckos require tall enclosures with plenty of vertical climbing space.

• Juveniles: Smaller grow-out enclosures or tubs can be used temporarily

• Adults (minimum): 45 × 45 × 60 cm

• Recommended: 60 × 45 × 90 cm or larger

Larger localities, particularly those from Grande Terre, will benefit from significantly more space.

Height is far more important than floor space, as these geckos spend most of their lives off the ground.

Enclosure Setup

A well-structured enclosure should mimic a forest canopy environment and include:

• Sturdy vertical and horizontal branches

• Cork bark tubes and hollows (essential for security)

• Dense foliage for cover (live or artificial plants)

• Elevated feeding ledges

Leachies feel most secure when they have multiple hiding options, especially enclosed spaces that replicate tree cavities.

Substrate

Suitable substrate options include:

• Bioactive soil systems (ideal for long-term setups)

• Coconut fibre or soil mixes

• Paper towel (recommended for quarantine or juveniles)

Bioactive setups are increasingly popular, as they help maintain humidity and reduce maintenance while providing enrichment.

Temperature and Heating

Leachianus geckos thrive in relatively mild temperatures compared to many reptiles.

• Ambient temperature: 22–24°C

• Warm spot: 24–26°C

• Night-time drop: Down to ~20°C is acceptable

Overheating is one of the most common and serious risks. Temperatures above 28°C can quickly lead to stress or fatality, so careful monitoring is essential.

In most homes, supplemental heating is minimal or unnecessary, but a low-wattage heat source may be used if needed to maintain stability.

Humidity and Hydration

Maintaining proper humidity is crucial:

• Target range: 60–80%

• Light daily misting is recommended

• Allow the enclosure to partially dry between mistings

This natural humidity cycle helps prevent respiratory issues and supports healthy shedding.

Leachies will often drink water droplets from leaves and enclosure surfaces rather than from bowls, although a water dish should still be provided.

Proper ventilation is just as important as humidity—stagnant, overly damp air can lead to health problems.

Lighting and UVB

While leachianus geckos are nocturnal, providing a natural light cycle is still important.

• 12-hour light / 12-hour dark cycle

• Low-level UVB lighting is beneficial but not strictly required

If used, UVB should be kept at low intensity to reflect their natural shaded habitat.

Diet and Nutrition

Leachianus geckos are omnivorous, feeding on both fruit and animal protein in the wild.

Staple Diet

A high-quality commercial crested gecko diet (CGD) should form the foundation of their nutrition. These diets are formulated to provide a balanced mix of fruit, protein, and essential nutrients.

Live Food

Live insects can be offered 1–2 times per week:

• Crickets

• Dubia roaches

All live food should be appropriately sized and dusted with calcium.

While insects are beneficial, overfeeding them can lead to obesity, particularly in adults.

Feeding Schedule

• Juveniles: Feed every other day

• Adults: Feed 2–3 times per week

Food should be offered in elevated dishes, as leachies prefer to feed off the ground.

Behaviour and Temperament

Leachianus geckos are known for their bold and sometimes defensive personalities.

• Primarily nocturnal

• Territorial, especially as adults

• Capable of vocalisations such as growling or barking

Some individuals tolerate handling, but many do not. They can deliver a strong bite if stressed, so handling should be kept minimal and respectful.

They are best suited to keepers who enjoy observing rather than interacting.

Housing and Compatibility

Leachianus geckos should generally be housed alone.

• Cohabitation can lead to stress or aggression

• Pairs should only be introduced for controlled breeding purposes

Even then, careful monitoring is required.

Cleaning and Maintenance

Routine maintenance is essential to ensure a healthy environment:

• Spot clean waste daily

• Clean feeding areas regularly

• Perform deeper cleans periodically depending on setup

Bioactive enclosures require less frequent full cleaning but should still be monitored and maintained properly.

Other Gecko Care Sheets

If you are interested in keeping other New Caledonian geckos, you may also find these care guides helpful:

• Gargoyle Gecko Care Sheet

• Crested Gecko Care Sheet

• Leachianus Gecko Care Sheet

• Mourning Gecko Care Sheet

• Sarasinorum Gecko Care Sheet

• Chahoua - Mossy Gecko Care Sheet

Each species has slightly different requirements, but many share similar environmental needs such as moderate temperatures and high humidity.

Health and Common Issues

A healthy leachianus gecko will display:

• Clear, alert eyes

• Strong grip and climbing ability

• A well-filled, muscular body

Common health concerns include:

• Dehydration

• Metabolic bone disease (due to calcium deficiency)

• Obesity from overfeeding

• Stress from incorrect temperatures

Regular observation and proper husbandry will prevent most issues.

Locality Differences

Leachianus geckos vary significantly depending on their locality within New Caledonia.

• Grande Terre (GT): Typically larger and heavier-bodied

• Isle of Pines and other island types: Often smaller and sometimes more vibrant in colour

While care requirements remain broadly the same, enclosure size and feeding should be adjusted according to the animal’s size.

Main Locality Groups

🟤 Grande Terre (Mainland)

These are often called GT leachies and are generally the largest.

• Mount Koghis
• Mount Dore
• Mount Humboldt
• Rivière Bleue
• Yaté
• Panié
• Aoupinié
• Canala
• Thio
• Koumac
• Bourail
• Col d’Amieu

👉 Characteristics:

• Largest size (some of the biggest leachies)
• Heavier build
• Often more muted, mossy/bark-like colours

🏝️ Island Localities (Smaller forms)

Isle of Pines (Île des Pins)

Often grouped under henkeli

• Isle of Pines
• Kunié (another name for Isle of Pines)

👉 Traits:

• Smaller than GT
• Often more contrast and pattern

Nuu Ana / Nuu Ami (very popular)

• Nuu Ana
• Nuu Ami

👉 Traits:

• Among the smallest leachies
• High contrast, bold patterning
• Very popular in the hobby

Other Offshore Islands

• Bayonnaise
• Moro
• Caanawa
• Brosse
• Nuu N’Da
• Nuu Yai
• Tenia

👉 Traits:

• Typically smaller than mainland animals
• Often more vibrant or patterned

⚠️ Important Notes

🔹 “Henkeli” vs “Leachianus”

You may see:

• Rhacodactylus leachianus leachianus (Grande Terre)
• Rhacodactylus leachianus henkeli (islands)

👉 However, this classification is debated and not always used strictly in the hobby.

🔹 Pure vs Mixed Localities

• Pure locality: From one specific region/island
• Mixed locality: Cross between different localities

🔹 Why Locality Matters

Locality affects:

• Adult size (huge difference)
• Colour and pattern
• Price (rarer localities cost more)
• Enclosure requirements

Final Thoughts

Leachianus geckos are a unique and rewarding species that stand apart from most reptiles in the hobby. Their size, intelligence, and longevity make them a serious commitment, but also an incredibly fulfilling one for the right keeper.

By focusing on proper environmental conditions, a balanced diet, and minimal stress, these remarkable geckos can thrive in captivity for decades.

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