Hi folks:)) I am wondering if squid, octos and cuttle fish have full colour vision?? I was wondering if a deep sea squid would actually need colour vision as thier environment is so dark naturally, so my presumption would be that they only need light sensors rather that a larger spectrum. Or do they in fact have eyesight that progresses into the "invisible" lights that we cannot see?? i.e. ultraviolet, infra red or whatever else is down there. Has there been any studies on the availability of these other forms of light down in thoise depths?? Have fun, keep smiling and take care. Tony.