Among insects there are sluggish herbivores, stick insects, shaped like a twig or a leaf. Name the type of adaptation

Among insects there are sluggish herbivores, stick insects, shaped like a twig or a leaf. Name the type of adaptation of these animals, explain its meaning and nature.

1) the type of this device – disguise (imitation of the bodies of nature), protective coloration and body shape;
2) meaning – protection from enemies, such as insectivorous birds;
3) the nature of the adaptation is relative, so when moving or changing the background of the substrate, the animal becomes noticeable.