
08/24/2025
Scientists observed a community of gloomy octopuses (Octopus tetricus) living together in the waters of Jervis Bay, Australiain in a site they named Octlantis. Contrary to the long-held belief that octopuses are solitary creatures, these individuals were seen building dens from shells, interacting socially, mating, fighting, and even evicting each other from their homes.
What makes Octlantis especially remarkable is that it was constructed entirely from natural materials. Octlantis was constructed entirely by the octopuses themselves using natural materials like clam and scallop shells, forming a kind of underwater “neighborhood”. According to the researchers, this behavior suggests a surprising level of social organization and territorial awareness, with individuals using color changes and body postures to communicate.
As noted in the study published in Marine and Freshwater Behaviour and Physiology, the octopuses not only tolerated each other’s presence but also interacted in ways that hint at a rudimentary form of community living. This opens up new questions about the evolution of intelligence and social behavior in invertebrates.