Mimetic octopus.

The mimic octopus is the smallest member of the family, but it is the "most outstanding performing artist" in the Indo-Pacific waters. The flexible body of molluscs, pigment cells all over the body, and eight flexible arms and legs allow them to change their shape and body color at will, and instantly complete various incredible transformations and disguises.

Mimic octopuses don’t just use various mimicry to scare predators. They will also act as courting sea crabs, trapping another crab to serve as their luxurious lunch. These clever little octopuses are able to imitate almost any creature according to circumstances, and their body color, shape and movements are all lifelike.