I'm of the opinion that octopi are rational beings. Look at this behavior:
http://www.youtube.com/watch?v=PmDTtkZlMwMhttp://www.youtube.com/watch?v=Juj5XyHiwDs&feature=relatedMaybe that's conscious, maybe it's instinctual. I don't know. But, I've seen things that make me believe that it's conscious.
See, my dad used to have a saltwater aquarium on a table in his living room with various fish and crabs that he collected from work. (He worked at Harbor Branch Oceanographic Institute) One day when I was down visiting him, he brought home an octopus (which we named Octavio) that he'd found in a tide pool. This little guy was fascinating to watch. He managed to depopulate that entire tank, killing fish and crabs that were five times his size.
To keep a steady supply of food on hand for the little dude, my dad set up a freshwater aquarium with a population of guppies on a desk a few feet away from Octavio's home. We figured that he could see them, but not get at them, until me or my dad put them in his tank.
But as it turned out, the guppies kept disappearing. We figured that they were fighting or that one of the neighborhood cats or a raccoon was getting them. However, after five days of the guppy population steadily declining, my dad saw this octopus squeeze out of his tank, down the table, across the floor, and up the desk to get at the guppy tank, and then return to his own tank.
Now, in my opinion, that would require rational thought. From the floor or the side of the desk, a creature two inches long could not see either the guppy tank or his home tank. He would have to plan in advance how to get to the other tank, and remember both where his home tank was and where the guppy tank was, in an environment that would slowly kill him and stop most of his senses from working.
Sadly, his intellect did not save him from my misjudgement. Since he killed anything and everything that we put in his tank, I wanted something else in his tank that he wouldn't kill. We got a sea anemone from one of the tide pools where my dad found Octavio and put it in the tank. Surprisingly, Octavio almost immediately attacked it, but a wrestling match with something his size that was coated with a billion poisonous stingers proved fatal for that poor little octopus. I still have Octavio in a jar of alcohol on my windowsill.