Spiny Devil Walking Stick

Eurycantha horrida can reach a length of about 12 centimetres (4.7 in) in males, of about 14 centimetres (5.5 in) in females. The body color ranges from pale green to brown. The young insects are glossy greenish. These ground-dwelling stick insects resemble bark or rotten wood. They have numerous small spines on their body and on their hind legs. Both sexes are wingless and look very similar. They exhibit the sexual dimorphism of many phasmids, as the males are darker, smaller and thinner and have enlarged hind leg femurs with a curved spine or thorn on the underneath side. Females are also brighter than the males and have a larger abdomen tipped with a beak-shaped ovipositor with which they lay the eggs in damp soil.

This species occurs in Papua New Guinea. It can be found in tropical rainforests in trees, shrubs and ground litter.

Males of the species have a large spine on their forelegs, which is used during mating to ward off other males from their mate.