The blue-ringed octopus solely hunts crayfish.
Blue-ringed octopus . They hunt small crabs , hermit crabs , shrimp , and other small crustaceans . Crustaceans ( Crustacea [ krʌˈsteɪʃə ] ) form a large , diverse arthropod taxon which includes such familiar animals as crabs , lobsters , crayfish , shrimp , krill , woodlice and barnacles .