Has anyone seen an octopus vulgaris displaying waves of color like a cuttlefish does? I dont know the technical term, but I'm sure you all know the "hypnotising" behavior cuttles can do. My brother caught an excellent video of an octopus in the Caribbean doing something similar. Waves of dark color rapidly moving across its white body in one direction when startled. It also displays several other dramatic color changes on camera. I've never come across a video of an octopus doing something like this and thought it was limited to cuttles and maybe squid. Is it a known behavior that I just missed? Anyone have a video handy? I will of course try to get him to post the video for you guys when we get back to civilisation. Thanks for your input!