Inhabits shallow reef caves and crevices and kelp beds along the coast and offshore islands.  This shark feeds at night on fishes and crustaceans and is totally harmless to divers.<P> For defense, the swell shark inflates its stomach with water to tightly lodge itself in a reef crevice.  <P> Edibility is poor.<P> Range is from Monterey Bay to Acapulco.  Also found in Chile.