The crustacean-like robots are made from an elastic "memory-foam" alloy that gets transformed into its 3D shape like a children's pop-up book: A 2D crab-shaped alloy outline is attached to a ...

while rockpool crabs did not match the background but instead relied on "disruptive colouration" -- the use of high-contrast patterns to break up the appearance of the body outline. Shore crabs ...

As for why the crab itself is fluffy ... “I expect that having the extra fluffy legs means that the outline is even more obscured.” ...