Stick insect
They often use "startle displays" for defence if discovered and threatened. As a predator approaches, they flash bright colors and make a loud noise. Some species, drop to the undergrowth to escape, and open their wings momentarily during free fall to show bright colors that disappear when the insect lands.  Others will maintain their display for up to 20 minutes, hoping to frighten the predator and convey the appearance of a larger size.  Some accompany the visual display with noise made by rubbing together parts of the wings or antennae. Some species, such as the young nymphs of E. tiaratum, have been observed to curl the abdomen upwards over the body and head to resemble ants or scorpions in an act of mimicry, another defence mechanism by which the insects avoid becoming prey.