Did you know that octopuses have three hearts, and two of them stop beating when they swim?

That's because the two branchial hearts pump blood to the gills, but when the octopus propels itself by jetting water, it puts extra strain on its main heart. So, to save energy, the body simply shuts down the gill circulation. The third heart, the systemic one, then takes over the oxygen delivery for the whole body — but it's a weaker pump, which is why octopuses prefer crawling to sprinting.

Feed · 20.08.2026

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