klausi
Contributor
The well-known shrimp-goby symbiosis. What I am not sure about is the reason for the odd jerking movements of the gobies. These are not the usual warning signals to the shrimp, I believe. Some of the jawing is respiratory, I assume, but why the upper-body jerks, and the bouncing up and down? Especially the goby at ~1:05 is making these movements.
