Phasmatodea is an order of insects, whose members are variously known as stick insects, walking sticks (the larger forms), ghost insects and leaf insects. Phasmids are insects that eat leaves and resemble leaves or sticks. They are usually green or brown but may reveal brightly coloured underwings when they fly. They have developed many unusual shapes to camouflage themselves to avoid detection by predators. The order Phasmatodea includes the longest insects in the world. About 150 species of phasmids are found in Australia. They usually live in gum trees but are sometimes found in gardens on rose bushes or fruit trees. However because of their excellent camouflage, they are often overlooked. When disturbed, a phasmid may sway, imitating a dead leaf or stick swaying in the breeze. During summer many people have found stick and leaf insects in the laundry, clinging to windows, and drowned in swimming pools.