The moth moth caterpillar lives on tree branches and looks like a twig. Name the type of her protective device

The moth moth caterpillar lives on tree branches and looks like a twig. Name the type of her protective device, explain its meaning and relative nature.

1) type of adaptation – disguise (imitation of motionless bodies of nature)
2) the caterpillar freezes on a branch and becomes invisible to insectivorous birds
3) the device becomes useless when the caterpillar is moving or when the background of the environment changes (it can be found by smell)

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