The Colossal Squid is bigger than a giant squid . Many sperm whales carry scars on their backs believed to be caused by the hooks of Colossal Squid . Colossal Squid are a major prey item for Antarctic sperm whales feeding in the Southern Ocean ; 14 % of the squid beaks found in the stomachs of these sperm whales are those of the Colossal Squid , which indicates that Colossal Squid make up 77 % of the biomass consumed by these whales .