Niserin/Getty Images
We may receive a commission on purchases made from links.
In a rapidly changing climate, evolutionary biologists are contemplating the future of life on Earth if humanity were to disappear. While many imagine a "Planet of the Apes" scenario, Oxford University professor and podcaster Tim Coulson proposes a more surprising successor: the octopus.
Professor Coulson’s research spans diverse ecosystems—from Yellowstone National Park to streams in Northern Trinidad and an island in the Outer Hebrides. In his popular science book, The Science of Why We Exist: A History of the Universe, he traces humanity’s origins and speculates on post‑human futures.
Coulson points to octopuses’ extraordinary nervous system. With the highest brain‑to‑body ratio among invertebrates, their nervous system is largely decentralized. While a central brain sits between the eyes, most neurons are distributed along the eight arms, each functioning like a mini‑brain. This arrangement allows independent movement, sensory perception, and problem‑solving without central input.
Octopuses are also renowned for their ingenuity. They solve puzzles, employ sophisticated hunting tactics, and have demonstrated remarkable escape skills—most famously Inky, who slipped from an aquarium and returned to the sea. Their muscular, bone‑free bodies grant exceptional dexterity, enabling them to manipulate tools and even fashion protective armor from coconuts.
While Coulson acknowledges that primates also possess intelligence and dexterity, he argues that a catastrophe large enough to wipe out humans would likely affect primates too, given shared environments. Octopuses, living in marine habitats, are insulated from terrestrial threats but are not immune to climate change. A 2024 study found that warmer waters increase embryonic mortality in cephalopods, although temperature rises have also led to population booms in the UK.
Despite their adaptability, octopuses have a short lifespan—typically up to two years for the common species—and are largely solitary. These traits present challenges to forming complex, civilization‑like societies.
Ultimately, Coulson’s hypothesis remains speculative. Yet it highlights the profound ways in which intelligence, nervous system architecture, and environmental resilience shape the potential for future dominant species.
Wrangel/Getty Images
Stockbym/Getty Images
