 Deimatic displays are made by insects including the praying mantises ( Mantidae ) and stick insects ( Phasmatodea ) . While undisturbed , these insects are usually well camouflaged . When disturbed by a potential predator , they suddenly reveal their hind wings , which are brightly coloured . In mantises , the wing display is sometimes reinforced by showing brightly coloured front legs , and accompanied by a loud hissing sound created by stridulation . For example , the grasshopper <unk> displays red and yellow areas on its hind wings ; it is also aposematic , producing a distasteful secretion from its thorax . Similarly the threat display of the walking stick phasmid ( <unk> <unk> ) is not a bluff : the insect sprays defensive <unk> @-@ like monoterpene chemical compounds at attackers . 
