Octopuses Have Three Hearts — But Two Stop When They Swim

🐙 Wow, Really?

Imagine having three hearts… and two of them give up every time you try to swim.

It sounds like science fiction, but it’s true. Octopuses — those strange, intelligent deep-sea aliens — have some of the most unusual biology on the planet.

Among their odd features? Three hearts, blue blood, and a serious dislike for swimming.

❤️ The Breakdown: 3 Hearts, 1 Body

🫀 Two branchial hearts — each pumps blood to one of the octopus’s gills
💓 One systemic heart — pumps oxygenated blood to the rest of the body

That’s a lot of circulation for one squishy cephalopod!

🏊‍♂️ Why Swimming is… a Problem

When an octopus swims using jet propulsion, something strange happens:

The systemic heart temporarily stops beating.

This means less oxygen reaches the rest of the body — and the octopus gets tired fast. It’s like running a marathon and holding your breath at the same time.

Result? Octopuses prefer crawling with their arms rather than swimming. It's more efficient and doesn't interrupt their blood flow.

💙 And Yes — Their Blood is Blue

Another twist: octopuses have blue blood, not red.

Why?

Their blood uses hemocyanin (copper-based), not hemoglobin (iron-based like ours)
Hemocyanin works better in cold, low-oxygen ocean environments

So not only do they have more hearts — they have alien blood too.

🧠 Fun Bonus Fact: They’re Also Brainy

Each octopus arm contains its own mini-brain — and yes, they can act independently.

So if you're keeping track: 3 hearts, 9 brains, 8 arms, and blue blood.

The ocean’s weirdest genius? We think yes.

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