Two tiny species of tropical octopus have demonstrated a remarkable disappearing trick. They adopt a two-armed 'walk' that frees up their remaining six limbs to camouflage them as they slink away from trouble.
"When we noticed one was walking, I thought my gosh, this is amazing. It's the first underwater bipedal locomotion I know of," says Christine Huffard of the University of California, Berkeley, who captured the behaviour on video.
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