Actually, they do "build cities" as it was recently discovered: https://qz.com/1077632/octlantis-is-a-just-discovered-underwater-city-engineered-by-octopuses/?m

Actually, they do "build cities" as it was recently discovered: https://qz.com/1077632/octlantis-is-a-just-discovered-underwater-city-engineered-by-octopuses/?mc_cid=4b3027a1f8&mc_eid=c8f5807ff1 https://qz.com/1077632/octlantis-is-a-just-discovered-underw...