Octopus are greatly missunerstood - they are fast learners AND what is most important can actually solve puzzles to get what they want, meaning you can present an octopus with a problem solving situation and he/she will actually try to find a solution.
Extremly interesting animals and way smarter than we thought they are
We had an octopus in the zoo were i did my apprentiantship when you cleaned his enviroment he would come out of his den and play with your hand your fingers like he would say greet you he would also on occasion steal your brush and you were not allowed to use a razorblade to clean the windows (which we usualy use on fishtanks to get the alge off) you had to scrub them off.
One one very few animals I always feelt sad that he was "locked" up.