Just incase anyone wasn't aware...the "head" of an octopus is actually located between the eyes were the brain is held. The mantle is the sack that most people mistake or reffur to as the head...it's actually the mantle, body OR trunk were the animal holds all its vital organs in. We do not hold our organs in our head, our organs are located in our bodies while our brain is located in our head. My mom thought the mantle was the ink-sack...lol.
Also, the octopus doesn't have legs. There arms or tentacles. I notice a lot of people mistake them for legs. Instead of walking, there usually used for gripping, holding and catching prey...which is what we do with our own arms. They occasionally use there arms as legs to bump along the sea bed or sea floor because of their lack of floating abilities which Squid and Cuttlefish have.
Just some useful insight.