Giant Walking Stick

The giant walking stick is the largest insect species native to North America, with females regularly exceeding 15 cm in body length. Its extraordinarily elongated, cylindrical body and matching thin legs give it an almost total resemblance to a woody stem or twig, a disguise that serves as its primary means of avoiding detection by birds and other visually hunting predators.

Found mainly across the south-central and southeastern United States, from Arizona and Colorado east to the Gulf states, this species favors deciduous trees and shrubs such as oak, hackberry, and grapevine, on which it feeds and rests. Despite its imposing size, it is a slow-moving, entirely plant-eating insect with no capacity to bite or sting people.

• Extremely long, slender, stick-like body, brown to grayish-brown or reddish-brown in color
• Females are noticeably thicker and longer than males, often exceeding 15-18 cm
• Long, thin legs held close to the body when at rest, extending the twig-like silhouette
• Long, thread-like antennae, shorter than the body
• Wingless in both sexes; no flight capability
• Lookalikes include other native walkingsticks (Diapheromera femorata), which are considerably smaller and more slender

This species is native to the central and southern United States, ranging from Arizona and Colorado eastward through Texas, Oklahoma, and the Gulf Coast states. It inhabits deciduous forests, woodland margins, hedgerows, and areas with dense shrub or vine growth, where its host plants are abundant. Adults are most often encountered from mid to late summer into early fall, typically resting motionless on branches and foliage during the day.

Giant walking sticks are nocturnal, becoming active after dark to feed on the leaves of a range of woody plants and vines, including oak, wild grape, and hackberry. During daylight hours they remain nearly motionless, relying on camouflage and a slow, rocking gait that mimics a twig moving in the wind rather than fleeing from threats. If disturbed or grasped, an individual may drop to the ground and remain still, or release a leg at a weak joint to escape a predator's grip. As herbivores, they play a minor role in the food web as prey for birds, and their leaf browsing has negligible impact on healthy trees.

Females scatter hundreds of hard, seed-like eggs by flicking them from the treetops to the forest floor over the course of the summer and fall. The eggs overwinter in leaf litter and typically hatch the following spring, sometimes taking more than one year to develop. Nymphs resemble miniature, more slender versions of the adults and pass through several molts, growing longer and thicker with each stage, without a pupal phase. There is generally one generation per year, with adults appearing from mid-summer through the first frosts.