Giant Prickly Stick Insect

Geographical Origin and Habitat: Native to eastern Australia, widely distributed in warm tropical and subtropical forests of Queensland and New South Wales. It lives primarily in the tree canopy, especially on eucalyptus trees, where it spends its entire life camouflaged among the foliage to escape birds and other predators.

Taxonomy and Genetics: Belongs to the family Phasmatidae, subfamily Extatosomatinae, genus Extatosoma. Described by Macleay in 1826. This species is famous for its reproductive strategy, utilizing both sexual reproduction and parthenogenesis; in the absence of males, females lay unfertilized eggs that hatch exclusively into female clones.

Behavior and Habits: Nocturnal and sedentary. During the day, it remains suspended motionless from leaves, swaying gently if disturbed to mimic a leaf blowing in the wind. Freshly hatched nymphs (nysi) mimic Leptomyrmex ants to escape predators, running rapidly on the ground before climbing trees. When threatened, it raises its abdomen like a scorpion.

Morphology: Displays extreme sexual dimorphism. Females are large, up to 12-15 cm (5-6 inches) long, flightless, with heavy, spine-covered bodies and leaf-like lobes on their legs. Males are smaller (7-9 cm), slender, smooth, and possess long, functional wings that allow them to fly to find mates. Coloration ranges from green to lichen-brown or straw-yellow.

Terrarium Setup: Requires a vertically oriented enclosure (minimum 30x30x45 cm / 12x12x18 inches for a pair, preferably 40x40x60 cm). The top panel and at least one side must be mesh to ensure adequate ventilation. The substrate can be simple paper towels or dry peat moss to collect waste and eggs. Insert fresh food plant branches placed in a jar of water with a blocked opening.

Lighting and Heating: The ideal daytime temperature should range between 22°C and 26°C (71.6°F - 78.8°F). During winter, a low-wattage heat emitter may be needed if room temperature drops below 18°C (64.4°F). No special lighting or UVB is required; ambient room light is sufficient. Avoid placing the enclosure in direct sunlight.

Humidity and Hydration: Requires moderate humidity, between 60% and 70%. This is achieved by lightly misting the enclosure walls and food leaves once daily, preferably in the evening. The insects drink water droplets directly from the leaves. Avoid standing water and excessive condensation on the walls to prevent lethal mold.

Feeding and Supplementation: Feeds exclusively on fresh leaves. The staple diet in captivity consists of blackberry bramble (available year-round), oak, hazel, eucalyptus, and rose leaves. Replace the food branches every 5-7 days before they dry out. No calcium or vitamin supplementation is required as they get all nutrients from fresh leaves.

Compatibility: Can be housed in small groups of its own species in the same enclosure, provided overcrowding is avoided, which can cause shedding failures. Can cohabitate with other peaceful stick insect species. Do not house with predators (such as mantises) or animals that could harm them.

Health and Common Diseases: Major health risks include mismatched or failed sheds (caused by low humidity or lack of vertical hanging space), which can lead to limb deformities or death. Mold caused by poor ventilation is highly lethal. Nymphs are fragile and highly sensitive to dehydration in their first few days.