Octopuses may be the most alien‑like animals on Earth
When people imagine “extraterrestrial life,” they often picture beings that function completely differently from us:
different bodies
different senses
different forms of intelligence
But we may not need to look to outer space. Here on Earth lives an animal that biologists frequently describe as otherworldly: the octopus.
Not because it is mystical, but because its biology and intelligence have evolved in ways fundamentally unlike our own.
Three hearts and blue blood 💙
Octopuses have:
three hearts
blue blood
Two hearts pump blood through the gills, while the third supplies the rest of the body. Their blue blood is caused by hemocyanin, a copper‑based oxygen carrier. Humans, by contrast, use iron‑based hemoglobin.
👉 Hemocyanin works especially well in cold, low‑oxygen environments, helping octopuses thrive under extreme ocean conditions.
Octopuses are some of the weirdest and most incredible creatures on Earth. They have three hearts, blue blood, and can even shut off their main heart while swimming—but why?
In this video, we break down: 🔹 Why octopuses need three hearts to survive 🔹 The science behind their copper-based blue blood 🔹 How they thrive in extreme ocean conditions 🔹 The crazy theory that octopuses might be alien-like creatures
2. A nervous system unlike ours
The octopus nervous system is one of the most unusual in the animal kingdom. About two‑thirds of its neurons are located in the arms, not in the brain.
This means the arms can partly:
coordinate movements
explore objects
make simple decisions
Researchers describe this as a form of decentralized intelligence — more like a distributed network than a single central brain.
In this video, we’ll explore the amazing nervous system of octopus arms, how they move without direct control, and why this alien-like intelligence is so mind-blowing!
3. Arms with their own “decision‑making”
Octopus arms often appear to act independently. Each arm can:
process thousands of sensory signals
respond autonomously
perform complex movements without direct brain control
Scientists have observed arms that: • explore objects on their own • perform different tasks simultaneously • adapt flexibly to new situations
👉 Biologically, this level of autonomy is extremely rare.
This short video shows how an octopuses arms make their own decisions.
4. Camouflage that feels like science fiction 🪸
Octopuses can change their:
color
pattern
contrast
even skin texture
…within seconds.
They imitate:
rocks
coral
sand
algae
and sometimes other animals
The mimic octopus is especially known for imitating the appearance and behavior of species such as flatfish or sea snakes.
👉 Their camouflage abilities are so precise that they inspire modern materials research.
The mimic octopus can change not only its color, but also its shape, movements, and behavior. This allows it to fool potential predators by imitating dangerous animals such as poisonous flatfish, sea snakes, and lionfish. It was only discovered in 1998 – perhaps because it had been hiding in plain sight all along!
5. Intelligence that evolved independently 🧠
The most remarkable aspect: Octopus intelligence evolved entirely independently from vertebrate intelligence.
The last common ancestor of humans and octopuses lived about 500 million years ago and was likely very simple.
Yet octopuses developed:
problem‑solving
learning ability
memory
tool use
curiosity
They show that complex intelligence does not need to follow a single evolutionary path.
📚 Book Recommendation:
“Other Minds: The Octopus, the Sea, and the Deep Origins of Consciousness” by Peter Godfrey Smith.
This book describes octopuses as “the closest thing to intelligent extraterrestial life”.
6. Why octopuses appear so often in science fiction
Octopuses have fascinated humans for centuries. In stories and films, they often appear as:
mysterious
intelligent
hard to understand
almost otherworldly
From ancient sea‑monster myths to modern science fiction, the idea of a highly intelligent being with a completely different sensory world is both captivating and unsettling.
Scientifically, octopuses remind us that intelligence does not have to look human.
7. “My Octopus Teacher” changed many people’s perspective
The documentary My Octopus Teacher introduced millions of viewers to a wild octopus.
Striking moments included:
the animal’s curiosity
its interactions with the diver
its seemingly individual personality
The film does not portray an “alien” in the literal sense — but it shows a creature whose perception and behavior feel both unfamiliar and surprisingly relatable.
A filmmaker forges an unusual friendship with an octopus living in a South African kelp forest, learning as the animal shares the mysteries of her world.
Conclusion
Octopuses seem alien because their biology followed a completely different evolutionary path.
three hearts
blue blood
a decentralized nervous system
autonomous arms
science‑fiction‑like camouflage
independently evolved intelligence
These traits do not make them monsters — they make them one of the most extraordinary examples of how diverse complex life on Earth can be.
Perhaps that is what fascinates us most: a creature that feels utterly foreign, yet whose curiosity and intelligence still remind us of ourselves.