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BiologyIntertidal, actively shuttling back and forth between rock pools and air (Ref. 31184). They breathe air when out of water (Ref. 31184). Can stay out of the water for up to 22-60 hours if kept moist (Ref. 51276). Found in estuaries, swamps, marshy areas and tidal mud flats. Moves around briskly on land preying on small animals. Used in Chinese medicine (Ref. 12166).