The distinctive Thorny Devil (Moloch horridus) is found in arid scrub and desert regions of Central Australia. Covered with large thorn-shape spines over its head, body, tail and limbs, the Thorny Devil also has a spinose hump on the back of its neck, that looks similar to two gumnuts joined together. The spines are sharp to the touch.

The colour is mottled arrangement of predominantly mustard yellow and rusty red. Colours can vary depending on the colour of the sand where the Thorny Devil lives. Those on the rust red of Central Australia taken on that colouration, whilst other found living on desert yellow/white sand are lighter in colour.

On occasion the ants that the Thorny devil feed on will clamber over its body. When this happens, the Thorny devil will close it’s eyes to prevent the ants biting it in the eye © Greg Sully

The Thorny Devil is well adapted to the arid regions of Australia with tiny channels between the scales on the belly and legs. Morning dew, damp sand and puddles of water are then channelled up and along the body of the Thorny Devil by capillary action to the mouth of the lizard. As they soak up water, their body colour become brighter and more vivid.

The Thorny Devil feeds exclusively on certain species of small black ants, eating anywhere between 1,000 to 5,000 ants per meal.

When you look at the underside of the Thorny Devils, each individual will have their own unique pattern, with no two Thorny Devil having the same pattern, providing a unique figure print that allows you to tell them apart.

The Thorny Devil can live for about twenty years, with breeding staring at three years of age. It attracts a mate through elaborate courtship rituals that include head-bobbing and leg-waving. The female then lays a clutch of 3-10 eggs in a chamber up to 30 cm below the surface of the ground. It can take anywhere between 13 to 18 weeks for incubation depending on the weather (the warmer weather speeds up the process). Once hatched, the young lizard starts to eat ants almost immediately.

The spectacular creature is a favourite of many young children and adults, with it’s strange jerky gait and tail held in an upward curve.

Images © Greg Sully

  • Scientific classification
  • Kingdom: Animalia
  • Phylum: Chordata
  • Class: Reptilia
  • Order: Squamata
  • Suborder: Iguania
  • Family: Agamidae
  • Subfamily: Amphibolurinae
  • Genus: Moloch
  • Species: M. horridus
  • Binomial name: Moloch horridus