How Did Octopus Became So Intelligent: Outsmarting Predators?

Octopuses have three hearts and blue blood, which already sounds like science fiction. Two of the hearts pump blood through the gills, while the third pumps it to the rest of the body. The wild part is that the main heart actually stops beating when the octopus swims, which is why they prefer crawling along the ocean floor instead of swimming. Their blood is blue because it uses a copper based protein called hemocyanin to carry oxygen, which works better in cold, low oxygen environments deep in

Octopus escaping through a 1 inch diameter hole