Risso's dolphin
Little is known of the behaviour and ecology of this squid but it seems to breed over the continental slope as juveniles in the size range have been found there. Adults are eaten by various cetaceans including sperm whales ("Physeter macrocephalus"), pygmy sperm whales ("Kogia breviceps") and Risso's dolphin ("Grampus griseus"), a fact confirmed by examining the stomach contents of stranded animals among which the indigestible beaks of the squids are found.