They are able to reproduce by parthenogenesis: females can lay fertile eggs without being fertilized by a male. Such eggs produce only females. The eggs resemble the seeds of the trees on which stick insects live, providing camouflage and protecting them from predators.
The eggs can change colour and become covered in hairs if humidity levels rise. These changes are irreversible, however.
Males have much shorter lifespans than females: about three months for males, and six months for females. Young leaf insects are often a reddish-brown, imitating the colour of young tree shoots and offering ideal camouflage.