Study reveals how octopuses adapt their escape tactics to gap size
Researchers observed common and Mayan octopuses using different strategies to exit boxes through holes of varying widths, findings that may inform the design of soft-bodied rescue robots.
Researchers filmed young common octopuses and Mayan octopuses as they escaped from clear Perspex boxes through openings of different dimensions. The study, led by Wenci Xin of the National University of Singapore with collaborators from the University of Naples Federico II and Austria's Haus des Meeres-Aqua Terra Zoo, measured each animal's eye span – 15 to 35 mm – as a proxy for the smallest gap the creature could negotiate. Boxes were fitted with holes either slightly larger than this span or up to 5 mm smaller.
When the opening was larger, the octopuses first probed it with their arms, pushed a front left arm through, and then sequentially threaded additional limbs, eventually pulling the head and mantle through in about 20 seconds. In the tighter opening, common octopuses altered their approach: after threading as many arms as possible, they pulled the remaining limbs through, compressed the mantle slightly, and dragged it out in a two-stage maneuver. The researchers noted this shift was unexpected.
Mayan octopuses displayed a different behavior, avoiding the narrow gap altogether and opting for the larger opening after briefly inspecting both.
Xin and colleague Cecilia Laschi said the observations could guide the development of soft-bodied robots for search-and-rescue missions and underwater exploration. Current robots often rely on slender, snake-like designs that limit sensor and manipulator capacity, whereas octopus-inspired mechanisms might allow more flexible navigation through debris. The study cautioned that it involved juvenile specimens in artificial boxes, so further work is needed to confirm whether adult octopuses in natural settings use the same tactics.