Phasmatodea is an order of insects, whose members are variously known as stick insects, walking sticks (the larger forms), ghost insects and leaf insects. The name is derived from the Greek "phasma" meaning an apparition or phantom, and refers to the cryptic appearance and mimetic behavior of these insects. Some species are capable of secreting a substance from the shoulder joints of the front legs that is similar to pepper spray in that it causes an intense burning irritation of the eyes and mouth of potential predators on contact.
In old classifications they were considered a suborder of Orthoptera.

British and Irish Stick-Insects of Cornwall - Provides an article with photos on New Zealand's prickly, armed, and smooth stick insects that are now found in the South West of Britain and Ireland. Also includes information about the laboratory stick insect.
Meta Description: [ Details of stick-insects in Cornwall, including maps. ]
Guide to the Stick Insects of Australia - Taxonomy, identification key, maps, and bibliography by Peter Miller.
Phasmida - General discussion of this group of terrestrial, nocturnal, phytophagous insects found in nearly all temperate and tropical ecosystems.
Phasmids in Cyberspace - Walkingsticks: images, biology, chat, and phasmids as pets.
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