to save any interested parties a search: groups of 10-15 octopi have been dubbed 'octlantis' and 'octopolis' after being discovered off the coast of Australia. this is remarkable because octopi (including gloomy octopi) were previously thought to be largely solitary creatures which only interact when mating. octlantis features social hierarchies, disputes, and dens fashioned out of the shells of their prey which the creatures have been recorded evicting each other from. interesting stuff
https://www.smithsonianmag.com/smart-news/octopus-city-obser...