Leachianus Gecko (Nuu Ana)

Leachianus Gecko (Nuu Ana)

Scientific Name: Rhacodactylus leachianus
Common Name: Leachianus Gecko, New Caledonian Giant Gecko (Nuu Ana locality)

Species Overview

Size: Adult Nuu Ana Leachianus Geckos typically do not weigh over 220g and average around 12-14 inches in length.

Appearance: These are one of the smallest localities of leachianus gecko to date with short tails, a short, broad head, and a rather compact body and limbs. The primary distinguishing colouration of the Nuu Ana locality are the white to pink blotches that are heavily peppered with specks of black against a light green to yellow background. They may also display a slightly backward tilting iris, giving them a 'stargazing' appearance.

Distribution: Endemic to Nuu Ana, a small island close to the Isle of Pines (Île des Pins), located south of the main island of New Caledonia.

Habitat: In the wild, these geckos inhabit coastal and lowland forests, residing in large tree hollows and under loose bark. In captivity, they thrive in tall, naturalistic enclosures that provide both vertical climbing opportunities and secure hiding areas.

Behaviour: Nuu Ana Leachianus Geckos are nocturnal, intelligent, and highly vocal. They produce an array of sounds—chirps, growls, and grunts—used to communicate or defend territory. They are curious and often confident once acclimated but may become territorial toward other adults. While some individuals can be calm, they are best regarded as display reptiles rather than handling pets due to their strength and independent nature.

Captive Care

Enclosure: Provide a vertically oriented terrarium measuring at least 24 inches × 18 inches × 36 inches (60 × 45 × 90 cm) for a single adult, though larger is always preferable. Include thick branches, cork tubes, and sturdy climbing structures. Live plants such as Philodendron, Pothos, or Ficus help maintain humidity and offer cover. A bioactive setup closely replicates their natural environment.

Temperature & Humidity: Maintain daytime temperatures between 75–82°F (24–28°C) and allow nighttime drops to 68–72°F (20–22°C). Avoid temperatures exceeding 85°F (29°C). Humidity should remain between 60–80%, achieved through daily misting and good ventilation. Allow partial drying between misting cycles to prevent mould.

Lighting: Although nocturnal, Leachianus Geckos benefit from low-level UVB (2–5%) to support calcium metabolism and maintain healthy circadian rhythms. Use a 12-hour day/night cycle with shaded areas for retreat.

Diet: Offer a varied diet of high-quality commercial gecko diets (CGD) designed for Rhacodactylus species, supplemented with gut-loaded insects such as roaches or crickets weekly. Feed adults 3–4 times per week and juveniles more frequently. Rotate CGD flavours and include occasional fruit purée to encourage feeding diversity.

Behaviour in Captivity: Leachianus Geckos are intelligent and observant. Many individuals quickly learn feeding schedules and will actively watch for keepers. They adapt well to captivity when provided consistent humidity and stable temperatures. Some individuals can become relatively docile, though others remain territorial, especially during breeding.

Special Considerations: Never house adults together outside of proven breeding pairs, as territorial aggression can occur. Always monitor new introductions carefully. Maintain balanced humidity—neither overly wet nor dry—and avoid overheating. These geckos require patience and consistency but are extremely rewarding to keep.

Taxonomy Note

The Leachianus Gecko (Rhacodactylus leachianus) belongs to the family Diplodactylidae and is native to New Caledonia. Locality variation across the species reflects long-term isolation among New Caledonia’s numerous islands, each population evolving slightly different traits.

Genetics Note

There are no recognized morphs of Rhacodactylus leachianus. However, significant natural variation exists between localities, including Pine Island, Nuu Ami, Nuu Ana, and Bayonnaise. The smaller size and less aggressive demeanor of the Nuu Ana makes this locality very popular among hobbyists.