WALKINGSTICK

also called stick insect any of about 2,000 species of slow-moving green- or brown-coloured insect belonging to the family Phasmatidae (order Phasmatodea). Its resemblance to twigs is a protective device; some species may also have sharp spines, an offensive odour, or eggs that closely resemble seeds. Walkingsticks have the ability to regenerate legs and antennae. The wings of some species have short, leathery covers; some have large, colourful hind wings that are kept folded over the abdomen. Tropical species of walkingsticks are the largest and most abundant; certain species (such as the Asiatic Palophus and the East Indian Pharnacia) are more than 30 cm (12 inches) in length. The North American species Diapheromera femorata may defoliate oak trees during heavy infestations.