Thorny Devil (Moloch horridus)

ReptileLizardDesert

Overview

The thorny devil (Moloch horridus) is a small, slow-moving lizard of the Australian deserts and one of the most unmistakable reptiles in the world. Its whole body is covered in hard, conical spines, and it has a false “second head” — a spiny knob on the back of its neck — that it presents to predators by tucking its real head down. For all its fearsome name and armoured appearance, it is completely harmless: it has no venom and feeds only on tiny ants.

The thorny devil is also remarkable for the clever way it gets water in one of the driest places on Earth, channelling every drop of dew and rain across its skin straight to its mouth.

Note: details here cover the thorny devil as a species; treat general statements as approximate and verify against authoritative sources.

Habitat & Range

Thorny devils live in the arid scrub and sandy deserts of central and western Australia, in spinifex grassland and sandplain country. They are well adapted to this harsh, hot, dry environment, where their colour can change to blend with the soil, and they shelter from extreme heat and cold by burrowing or hiding in cover.

Diet

The thorny devil is an extreme specialist: it eats almost nothing but ants, especially small black ants, which it laps up one at a time with a quick flick of the tongue — sometimes thousands in a single meal. It often sits beside an ant trail or near a nest and methodically picks off the passing ants, a feeding style suited to its slow, deliberate lifestyle.

Behavior

One of the thorny devil's most famous tricks is harvesting water. Tiny grooves between its scales form a network of channels that draw water by capillary action — from dew, rain, or damp sand — across the whole body and funnel it to the corners of the mouth, so the lizard can effectively “drink” through its skin. It moves with a slow, rocking, jerky gait that may help it blend into the shimmering desert, and when threatened it relies on its spines, the decoy head, and inflating its body rather than fighting or fleeing fast.

Human Interaction & Conservation

The thorny devil is a beloved icon of the Australian outback and completely harmless to people — despite the alarming name, it neither bites dangerously nor has venom. It is generally widespread in suitable desert habitat, though it depends on healthy ant populations and can be affected by habitat change. Consult authoritative sources for current status.

More photos of the thorny devil