Octopi are not stupid creatures. Scientists have trained them to perform simple tasks. They have been observed pulling the stoppers out of bottles to get at the stuff inside, and even unscrewing jar lids. Some of the largest octopi live not in some remote deep part on the Indian Ocean, but in Puget Sound in the State of Washington, where they have been found with armspans up to 30 feet (9.1 meters) long.
On some distant planet with large oceans, octopi may have evolved into the dominant species, in terms of intelligence. Could beings exist somewhere that are better able to communicate, more compassionate, and more successful than humans, that have eight flexible arms and live underwater?