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Species Atlas

DragonsWild only

Thorny devil

Moloch horridus · also Thorny dragon, Mountain devil, Moloch

The thorny devil drinks through its skin: water from damp sand or dew wicks along tiny grooves between its spikes all the way to its mouth.

Size
up to about 20 cm long
Lifespan
up to about 20 years
Diet
ants only, often thousands in a day
Active
diurnal, most active in the milder parts of the day
Home
sandy deserts, spinifex and mallee country
Status
Least Concern (IUCN)

Meet the Thorny devil

Few lizards look as fierce, or are as harmless, as the thorny devil. This small desert dragon is covered in densely packed spikes and walks with a slow, rocking gait that is thought to confuse birds of prey.

It is a strict ant specialist. A thorny devil parks itself beside an ant trail and flicks up ants one at a time with its sticky tongue, eating thousands in a day.

Water is scarce where it lives, so its skin does the drinking. Narrow channels between the scales draw water by capillary action from damp sand, dew or rain, moving it across the body to the corners of the mouth. When threatened it tucks its real head down between its front legs and presents a spiny 'false head' on the back of its neck, and it can puff itself up to look bigger.

John Edward Gray named the species Moloch horridus in 1841. Moloch is the name of an ancient Near Eastern god usually depicted as a monstrous figure, and horridus means bristly or rough. In spring, males court females with head-bobbing and leg-waving, and females lay about 3 to 10 eggs in a burrow around 30 cm deep.

Where it lives

Much of arid Australia, including large parts of Western Australia, the southern half of the Northern Territory, South Australia and western Queensland. Found on sandy plains and sandridge desert with spinifex and mallee.

Its place in Australian culture

First Nations connections

At Uluṟu-Kata Tjuṯa, Aṉangu know the thorny devil as ngiyaṟi in Pitjantjatjara and Yankunytjatjara.

Aboriginal and Torres Strait Islander knowledge belongs to its custodians. We only share what has been made public, and we encourage hearing stories from Traditional Owners on Country.

Australian story

Its genus name, Moloch, borrows from an ancient Near Eastern deity long pictured as a fearsome beast — a fitting name for a lizard that looks this dramatic. Today the thorny devil is one of the best-known symbols of Australia's Red Centre.

Fun facts

  1. It drinks by wicking water through grooves in its skin to its mouth.
  2. It eats only ants, often thousands in a single day.
  3. The spiny lump on its neck is a 'false head' used to fool predators.
  4. It changes colour, getting darker when cold or alarmed.
  5. It can live for up to about 20 years.
Wild only

Can you keep one?

Thorny devils are protected wildlife and their ant-only diet makes them unsuitable as pets, so they are not part of the pet trade.

The best way to meet one is in the wild or at a wildlife park — look, enjoy, and leave it be.

For fans of the Thorny devil

Complete Guide to Reptiles of Australia

Desert reptile spotting

Covers the thorny devil alongside the other dragons you might meet in the outback.

See options on Amazon AU

Thorny devil plush toy

Kids who love weird animals

A soft version of Australia's spikiest lizard makes a great gift for young naturalists.

See options on Amazon AU

Thorny devil children's book

Young readers

Picture books about the thorny devil explain its ant diet and skin-drinking trick in kid-friendly language.

See options on Amazon AU

Wide-brim sun hat

Outback road trips

Thorny devils are often spotted crossing desert roads in the heat of the day, so you'll want sun protection while you look.

See options on Amazon AU

Questions people ask

Is the thorny devil poisonous or dangerous?

No. Despite its spikes and name it is harmless, and its spines are for defence and water collection.

How does a thorny devil drink water?

Tiny channels between its scales draw water from damp sand, dew or rain by capillary action and carry it to its mouth.

Can you keep a thorny devil as a pet?

No. Thorny devils are protected wildlife and only eat particular ants, so they are not suitable or available as pets.

Meet more natives

Browse all 32 species

General information for Australian keepers, not veterinary advice. As an Amazon Associate, Oddball Animal Works earns from qualifying purchases. It never changes your price. About our links

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