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Cuttlefish can change colours and textures for camouflage purposes. Researchers found cuttlefish communicate by waving their limbs. A study identified four distinct waving patterns among cuttlefish.

A plume of ink can help hide a cuttlefish as it scuttles away from a predator. But that smoke screen’s stench may also warn sharks to stay away. Nicknamed “swimming noses,” some sharks can sniff their ...