Do you know that Octopuses have three hearts?
Squids too, one heart circulates blood around the body, while the other two pump it past the gills, to pick up oxygen.
This is because Haemocyanin in their blood is less efficient as an oxygen transporter than hemoglobin in vertebrates.
Therefore three hearts help to compensate for this by pumping blood at higher pressure around the body to supply the octopuses’ active lifestyle.

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