Beneath the ocean’s surface lives a creature that seems almost otherworldly – the octopus.

Three hearts instead of one

Unlike humans, an octopus does not rely on a single heart to survive, but three! Two of these hearts work tirelessly to pump blood through the gills, absorbing oxygen from the water, while the third sends that oxygen-rich blood to the rest of its body.

Blue blood

Even more fascinating is the colour of that blood! Instead of red, like ours, an octopus’ blood is blue.

This is because it uses a copper-based protein to carry oxygen, allowing it to thrive in the cold, low-oxygen depths of the sea.

With three hearts and blue blood, the octopus is a reminder that life beneath the waves can be as strange as it is wonderful.

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