PHOctopuses have three hearts and blue blood — but that's just the beginning of what makes them one of the most alien creatures on Earth.
Two of their three hearts are dedicated exclusively to pumping blood through their gills, where oxygen is absorbed. The third heart then circulates that oxygenated blood to the rest of the body. Here's the wild part: when an octopus swims, that third heart actually stops beating. That's why octopuses prefer crawling along the ocean floor rather than swimming — swimming exhausts them.
Now, about that blue blood. Instead of hemoglobin (the iron-based protein that makes our blood red), octopuses use hemocyanin, which is copper-based. Copper gives their blood a bluish tint when oxygenated. Hemocyanin is far more efficient at transporting oxygen in the cold, low-oxygen depths where many octopuses live. That said, it's less efficient overall, which is partly why octopuses need not one, but three hearts to keep things moving.
But wait — there's more weirdness. Octopuses have nine brains: a central brain and a mini-brain in each of their eight arms. This means each arm can essentially think and act independently — tasting, touching, and even making decisions on its own. An octopus arm that's been severed can still react and move for hours.
They're also masters of camouflage, capable of changing not just color but texture in milliseconds, matching rocks, coral, and sand perfectly. And they're shockingly intelligent: they've been observed opening jars from the inside, playing with toys, recognizing individual humans, and escaping tanks to sneak snacks from neighbouring aquariums.
Oh, and their ink? It's not just a smoke screen — it contains a chemical that temporarily messes with a predator's sense of smell and sight.
Three hearts, blue blood, nine brains, shapeshifting skin, and escape-artist intelligence. If nature designed an alien, it would look like an octopus.
Two of their three hearts are dedicated exclusively to pumping blood through their gills, where oxygen is absorbed. The third heart then circulates that oxygenated blood to the rest of the body. Here's the wild part: when an octopus swims, that third heart actually stops beating. That's why octopuses prefer crawling along the ocean floor rather than swimming — swimming exhausts them.
Now, about that blue blood. Instead of hemoglobin (the iron-based protein that makes our blood red), octopuses use hemocyanin, which is copper-based. Copper gives their blood a bluish tint when oxygenated. Hemocyanin is far more efficient at transporting oxygen in the cold, low-oxygen depths where many octopuses live. That said, it's less efficient overall, which is partly why octopuses need not one, but three hearts to keep things moving.
But wait — there's more weirdness. Octopuses have nine brains: a central brain and a mini-brain in each of their eight arms. This means each arm can essentially think and act independently — tasting, touching, and even making decisions on its own. An octopus arm that's been severed can still react and move for hours.
They're also masters of camouflage, capable of changing not just color but texture in milliseconds, matching rocks, coral, and sand perfectly. And they're shockingly intelligent: they've been observed opening jars from the inside, playing with toys, recognizing individual humans, and escaping tanks to sneak snacks from neighbouring aquariums.
Oh, and their ink? It's not just a smoke screen — it contains a chemical that temporarily messes with a predator's sense of smell and sight.
Three hearts, blue blood, nine brains, shapeshifting skin, and escape-artist intelligence. If nature designed an alien, it would look like an octopus.