New Caledonian Giant Gecko

Rhacodactylus leachianus

"Devil in the Trees"

The world's largest gecko, this species uses a unique language of whistles, chirps, and growls to communicate. The loud noise they make has led locals to call them the "devil in the trees."

About the Species

This species is the largest gecko in the world.

On the island of New Caledonia, this species can get up to 43 centimeters and weigh 200–300 grams. On surrounding smaller islands, it may only get to be 32 centimeters; but that's still pretty large. The males usually hang out on the lower branches and defend their territories from other males, while the females spend most of their time on the branches above. Sleeping during the day, these nocturnal geckos come out to forage at night for anything they can eat. They enjoy insects, small animals, fruit and even flowers. They are great at navigating branches and leaves to reach food and hiding places, using their Velcro-like toe pads, claws and large scales on the tail to effortlessly grip the trees. The green, brown and grey coloration of this gecko helps this species camouflage in the forest canopy. Geckos can hang on with their large toe pads, but unlike others, this gecko has claws and specialized scales on its tail to help in the trees.

Words From the Experts


This is the largest species of gecko in the world!


Did You Know?

Loose folds of skin make this large gecko look like it still has growing room.



New Caledonia, off the east coast of Australia


Arboreal locations of coastal and mountain forests


12–17 inches (32–43cm)


(Omnivorous diet) insects, small mammals, lizards, fruit, flowers


Birds, introduced domestic cats and dogs

Natural Defenses

Camouflage, loud hissing and ability to regrow (shorter) tail


2–3 eggs per clutch (multiple times per year)


Least Concern

Life Expectancy

8 years

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