Millions of years ago, predators lived in the depths of the seas, whose modern relatives can hardly hold a candle to them. The legendary basking shark Megalodon is said to have reached a length of more than 20 meters, while reptiles from the ichthyo- and plesiosaur groups reached similar dimensions. The ancestors of octopods receive less attention, although molluscs can also be both predatory and very large. However, according to a bold estimate, some prehistoric octopuses can be found to be of a similar size to basking sharks and dinosaurs, as a Japanese research group is now reporting.
