I really became fascinated by sea urchins lately! What curious animals, intelligent skins with spines and hands, but without a central brain. And there are quite a few species in the Philippines. I made a few videos about these urchins and their behavior:
This is an explanation of our research project:
A sea urchin defecating, filmed in the field, in the Philippines! Which other nature videographer can claim to have captured that?
Sea urchin communication? I think this could be what we are looking at.
Sea urchin tool use? It’s camouflaging behavior for sure: