I'm making some research about squids, as I’m writing a book that in some way involves them. I have a very peculiar question to ask: somebody told me that squids communicate changing colours, like a physical language or something like that (sorry, I'm new in this, and I know the question might sound pretty obvious) Is this true? I would be very grateful if you could answer me, or re-direct me to a web page to get this information from it. Thanks a lot. Sebastian.