A couple of days ago, I saw an octopus while snorkeling. It was on a vertical face of rock and when I showed up it slipped around the corner out of sight. I followed and could see it had gone into a recess there. I saw a tentacle moving and then, moments later, a round white thing appeared, a tentacle clasped around it.
I was mystified. I thought it might be the remains of an urchin or something. The white globe disappeared back into the depths. Moments later it appeared out of the side of the recess and it quickly became clear that the round white balloon was the head of another, completely white octopus. This white coloration is adopted when an octopus is feeling aggressive or threatened.
After a brief flurry of tentacles the white octopus disengaged, shot away a short distance, and changed color again as it landed on a rock. The octopus I’d first seen appeared again at the entrance of the recess. There was a little more to and fro before the evicted octopus gave up and moved away and the first octopus slipped back into the depths of the recess. My take on this was that the octopus I saw first wasn’t happy to find the other octopus in its lair and turfed it out.
The top photo shows the evicted octopus gathering itself after being run off. The second photo shows it on the move, still with the white coloration. The third photo shows the victor in the dispute, looking a little smug if I may say so.