Octopi have three hearts and pump green blue blood. I think it's because the use cobalt in their blood cells rather than Iron.
(chasbo zelenaReal Immodesty, Sat 21 Mar 2020, 8:57,
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It's the copper in haemocyanin when oxygenated
(MudfaceThe web isn't callipygian, Sat 21 Mar 2020, 9:32,
Reply)
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