Name the type of protective device, explain its significance and relative character in the caterpillar of the moth butterfly

Name the type of protective device, explain its significance and relative character in the caterpillar of the moth butterfly, which lives on the branches of trees and at the moment of danger becomes like a knot.

1) Imitation of the motionless bodies of nature (imitative similarity), protective color and shape – this is a disguise.
2) The caterpillar freezes motionless on a branch and becomes like a knot and invisible to insectivorous birds.
3) But this does not give a full guarantee of survival, because when moving and against a different background, the caterpillar becomes noticeable to birds.

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