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 squid. Dumbo octopuses live in the deep open ...

Perhaps a jellyfish-riding paper nautilus, or maybe even an adorable deep-sea dumbo? No doubt those are ... dumpling that is the striped pyjama squid (Sepioloidea lineolate).