Some bigger specimens been found, however. The largest so far was 1.8 metres long and weighed 5.9 kilogrammes. But this is still tiny in comparison to the biggest cephalopod species, the colossal ...

By analyzing the content of stable heavy isotopes of carbon (δ13C) and nitrogen (δ15N) in the beaks, the researchers studied three closely related cephalopod species: the highly boreal Rossia ...