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" ... Octopuses have blue blood. Most animals’ blood is red thanks to a molecule called hemoglobin, which transports oxygen in the bloodstream. Iron gives hemoglobin – and the rest of your blood – the red color that horror movie special effects departments love so much. But octopus blood uses a molecule called hemocyanin to move oxygen around. Because hemocyanin contains copper instead of iron, octopus blood looks blue. That would make for one weird slasher movie. ... "