Octopus
Octopus are among the most intelligent and fascinating animals found on coral reefs. With eight flexible arms lined with suction cups, no internal skeleton, and incredibly advanced eyes, they are masters of problem-solving, camouflage and escape.
Around Koh Tao, reef octopus are typically found between 3–25 metres, hiding within rock crevices, coral heads or sandy burrows. They are usually solitary and most active at dusk or during night dives.
Octopus can change colour, pattern and skin texture in an instant — transforming from smooth and pale to rough and mottled to perfectly match coral, rock or sand. When threatened, they may darken dramatically, spread their arms to appear larger, release ink, or jet away quickly.
Their flexible bodies allow them to squeeze through openings no larger than their beak — the only hard part of their body.
Find Octopus at...
Divemaster's tip
Look for subtle signs like small piles of discarded shells outside a hole — this can indicate an octopus den.
Move slowly and avoid shining bright lights directly into their eyes. If they turn very dark or retreat fully into a crevice, give them space.
What do they eat?
Look for subtle signs like small piles of discarded shells outside a hole — this can indicate an octopus den.
Move slowly and avoid shining bright lights directly into their eyes. If they turn very dark or retreat fully into a crevice, give them space.
