Though it may not be significant, Octopus species actually have been documented using tools to achieve their goals. They don't manufacture the tools, but have been observed making extreme efforts to choose the right tool.
Case study shows Octopus trying to open a bivalve clam shell, will often sort through several dozen rocks before selecting the particular rock with the best shape, for opening the shell. We humans are lucky, for if Octopus were 8 times larger, their brain capacity would be sufficient to challenge humanity as dominate species on earth.