Not all blood is red like ours; the octopus's blood is blue. The blue color comes from hemocyanin, the copper-containing protein that binds oxygen in the octopus. Human blood is red because its oxygen-binding protein, hemoglobin, contains iron. In addition to being blue, octopus blood is a poor carrier of oxygen, which helps explain the animal's sometimes apparent laziness. To cope with the low oxygen levels, the octopus maintains a constant high blood pressure and has three hearts. Two of the hearts pump oxygen-rich blood through the gills, while the third circulates it through the rest of the body.
end partial quote from:
https://animals.howstuffworks.com/marine-life/octopus1.htm
So, if you see just how different Octopuses are than humans and yet they constantly outsmart Sharks in the wild. They likely are as smart as pigs which are also smart like human beings too. Other really intelligent animals are whales, dolphins, some dogs, chimpanzees, gorillas and many other creatures here on earth.
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