How Indian walking sticks master the art of hiding in plain sight

Nature · Published 29 September 2026 Swipe more like this →

In short: Indian walking sticks are masters of camouflage, blending into their surroundings so effectively they often go unnoticed in local parks. Beyond their twig-like appearance, these insects possess a remarkable reproductive strategy that allows them to thrive without males, cloning themselves to populate environments with surprising speed and efficiency.

The Indian walking stick is a non-native insect that has successfully established itself in regions like the Bay Area. Researchers, including Edward Ramirez at the University of California, Berkeley, are currently investigating the genetics behind their extraordinary ability to remain hidden. These insects are considered uniquely effective at camouflage, prompting scientists to explore the mechanisms that allow them to maintain such a low profile against predators.

A defining feature of the Indian walking stick is its reliance on parthenogenesis. In this form of asexual reproduction, females do not require a male to fertilize their eggs. Consequently, no male Indian walking sticks have been observed. This process allows females to produce hundreds of offspring, significantly shifting the population ratio. By bypassing the need to search for mates, these insects can dedicate more energy to finding food and shelter, leading to faster reproduction and larger population sizes compared to species that rely on sexual reproduction.

However, this reproductive strategy comes with trade-offs. Because parthenogenesis does not involve mixing genes from two separate individuals, the population may suffer from a lack of genetic variation. Furthermore, asexual reproduction can make it difficult for a species to purge harmful mutations from its genome over time. While other species, such as the Australian stick insect, the Jungle nymph, and the Madagascar species Achrioptera fallax, do produce males under specific breeding conditions, the Indian walking stick remains a fascinating study in the survival advantages and genetic limitations of cloning in the insect world.

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