Description

The margin-winged stick insect (Ctenomorpha marginipennis) is a species from southern Australia that mimics a eucalyptus twig for camouflage. Males are long, slender, and have full wings for flying, while females are larger, have smaller wings, and are a master of disguise with a dark hind wing that flashes as a defensive display.

These insects primarily feed on eucalyptus leaves and are often found in coastal woodlands from southern Queensland to Victoria.

Appearance and characteristics
Body: Up to 20 cm long, narrow, and grey-brown to match eucalyptus twigs. Nymphs are bright green.
Wings:
Males: Long and slender with full wings that they use to fly.
Females: Larger than males, with smaller, dark hind wings that flash as a defense mechanism.
Legs: Long and dentated.

Habitat and diet
Habitat: Common in heaths and woodlands, particularly in coastal areas of southern Australia.
Diet: Primarily feeds on eucalyptus leaves.

Behavior
Defense: Mimicry is its primary defense. If camouflage fails, the female will flash her dark hind wings as a startling display.
Movement: They are known for their surprisingly quick movements.

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