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Short spines on a gray body, with many black spots all over the body & fins. Very large eyes. Length upto 55 centimetres.
Hides mostly during the days in caves or holes, found at depths between 6 and 36 metres. Mostly solitary - feeds on sea urchins and crabs.
If threatened inflates by drawing in water, turning into a ball of spines. May bite divers if harassed.