There are actually a very small number of octopus "cities". For one, see: https://www.smithsonianmag.com/smart-news/octopus-city-observed-180964936/ https://www

There are actually a very small number of octopus "cities". For one, see: https://www.smithsonianmag.com/smart-news/octopus-city-observed-180964936/ https://www.smithsonianmag.com/smart-news/octopus-city-obser... I highly recommend "Other Minds: The Octopus, the Sea, and the Deep Origins of Consciousness" for a fascinating look at octopus evolution and comparison to ourselves.