- Size
- Length: 70–100 mm
- Lifespan
- 6–10 months
- Diet
- Leaves of privet, rose, elm and various native shrubs.
- Habitat
- Gardens, parks and scrublands with diverse vegetation including ornamental plants.
- Range
- North Island and northern South Island in gardens and parks.
- Endemism
- Introduced
- Main Threats
- Pesticide use in gardens. Limited predation pressure.
- Population
- Common in urban and semi-rural areas particularly in the North Island.
- Conservation Status
- least_concern
- Human Risk
- harmless
- Handling Note
- body spines are brittle and may break off if grasped firmly
- Conservation Note
- Introduced parthenogenetic stick insect common in urban gardens and parks across the North Island, not subject to formal NZTCS threat classification.
- Te Ao Māori
- As an introduced species the Prickly Stick Insect has no traditional Māori cultural associations. Its arrival coincided with increased horticultural activity in the 19th century. It represents the unintended consequences of plant importation and garden establishment.
Spines cover its body. They are not for fighting. They make the Prickly Stick Insect difficult to swallow. Birds hesitate. This hesitation is enough. The insect does not run. It waits. The spines are sharp but brittle. They break off if handled roughly. Regrowth does not occur.
It feeds on a wide variety of plants. Privet, rose and elm are frequent targets in gardens. Native species like pōhutukawa are also consumed. The appetite is steady. Damage to ornamental plants is often attributed to caterpillars. This insect works more slowly. It strips leaves over weeks.
Habitat preference leans toward disturbed environments. Gardens provide consistent food sources. Parks offer shelter in mature trees. It avoids dense native forest where competition from other species is higher. Urban heat islands may extend its active season. Cold winters limit survival in southern regions.
Threats are minimal. Pesticides kill it if applied directly. Natural enemies include spiders and some bird species. Parasitic wasps may target eggs. However the population remains robust. Reproduction is parthenogenetic. Females produce viable eggs without mating. This allows rapid colonisation of new areas.
The range is expanding. It is well established in the North Island. Occasional sightings occur in the northern South Island. Climate change may facilitate further spread. Gardeners often mistake it for native species. Identification requires close inspection of the spines. Native stick insects lack this feature.
Eggs are dropped randomly from the female. They fall into leaf litter or soil. Incubation takes several months. Nymphs emerge ready to feed. Growth is gradual. Moulting intervals depend on temperature and food availability. Adults live for several months. The cycle repeats annually.