Stick bugs have regenerative properties. They can lose a limb and regrow it when they molt. Reproduction often occurs without the presence of a male, creating a generation of only female offspring. Stick bugs' ability to camouflage themselves is enhanced by their color and markings and is even more convincing due to the way they rock back and forth as they move, just like a twig in a breeze.
Stick bugs are alert to the danger of predators. To prevent predators from becoming alerted to its presence, the stick bug nymph quickly consumes its discarded exoskeleton. In addition to preventing detection, consuming the molted skin provides protein to the nymph.
Many stick insects utilize highly unusual methods to protect themselves from predators. Some spit up a substance that is unpalatable to the attacker. Others excrete a foul odor from joints in their bodies. Leg spines used for climbing can also be used to stick an enemy. Some varieties of stick bugs are capable of producing a chemical spray that works much like tear gas, blinding the predator.
Though the most observed color of stick bugs is brown, some have a chameleon-like talent of changing colors depending upon the background. Others have bright colors that are hidden on unexposed wings. These wings can be fluttered to confuse a predator that comes too close.