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octopus octupus octopuses octupuses octopus 3 hearts octopus blood octopus blue blood hemocyanin.

This is because their blood is different from ours.
Its blue because it contains hemocyanin which is great for surviving in cold and low oxygen water, but is not as efficient as hemoglobin.
That is why they need extra hearts to keep the oxygen flowing.
And the crazy part is that their main heart stops beating when they swim, because swimming is too demanding for them.