Photo by National Cancer Institute on Unsplash

The first time marine biologist Jennifer Mather watched an octopus in her lab carefully unscrew the lid of a jar to reach the crab inside, she realized something profound: intelligence isn't a ladder we climb. It's a bush with branches growing in wildly different directions. This wasn't a mammal or bird doing something we'd expect. This was a creature whose brain is organized so differently from ours that calling them "intelligent" almost feels like we're using the wrong word entirely.

Octopuses have been around for roughly 300 million years. Humans? We've been here for about 300,000. Yet when it comes to problem-solving, adaptability, and pure behavioral flexibility, these eight-armed cephalopods are running circles around us—despite having a brain smaller than a walnut.

The Weirdest Brain in the Ocean

Here's where things get genuinely strange. Of an octopus's roughly 500 million neurons, about 350 million live in its arms. Not its central brain. Its arms.

This means an octopus's arms can think independently. An octopus can be solving a puzzle with its brain while its arm simultaneously hunts for food. The arms taste what they touch through chemoreceptors, navigate obstacles without input from the central nervous system, and even continue searching for food after being severed. It's distributed cognition in a way that would make any computer scientist jealous—and frankly, deeply unsettled.

Dr. Peter Godfrey-Smith, a philosopher of science who has spent considerable time observing octopuses in their natural habitat, describes them as "alien intelligences." And he's not being poetic. When you watch an octopus problem-solve, you're not watching something that thinks like a human. You're watching something that thinks like... well, like nothing else on Earth.

Masters of Deception and Escape Artists Supreme

If you've ever owned a fish tank, you know they're relatively predictable. Octopuses? They're escape artists with PhDs in misdirection. One octopus at the Santa Monica Pier Aquarium would systematically escape its tank at night, raid neighboring tanks for snacks, and return to its own tank by morning. It took weeks for staff to figure out how it was doing it.

But here's what really demonstrates their intelligence: the octopus didn't just memorize a route. It changed its escape method based on what obstacles the keepers placed in its way. It learned. It adapted. It anticipated.

Their ability to change color and texture in milliseconds isn't just camouflage—it's a communication system we're only beginning to understand. They can display emotional states through their skin. An upset octopus turns pale and textured. A hungry octopus develops a particular ripple pattern. They're essentially wearing their thoughts on the outside of their bodies.

Consider the mimic octopus, which can impersonate over 15 different species of fish and crustaceans by changing its appearance and behavior. Not just its color—its actual body shape and movement patterns. This requires an understanding of what other creatures look like and how they move. It requires empathy-adjacent understanding, or at least a sophisticated modeling of another creature's perspective.

The Tool-Using Philosophers

For decades, scientists believed that tool use was the hallmark of primate intelligence. Then octopuses showed up with coconut shells and clam shells, arranging them as portable shelters. They were using tools. But more remarkably, they were carrying tools from one location to another—something chimpanzees do, something dolphins might do, but something we don't expect from an invertebrate with an alien nervous system.

The underwater footage of an octopus methodically stacking clam shells is almost haunting. It shows purposefulness. Planning. The ability to imagine a future state ("I'll be safer if I have this shelter") and work backward to make it happen. That's not instinct. That's genuine reasoning.

And then there's their play behavior. Octopuses in captivity juggle objects. They squirt water at humans who displease them. They seem to enjoy the act of exploration for its own sake. Neuroscientist Benny Sharbaro has documented octopuses deliberately unscrewing jar lids while making no attempt to eat what's inside—apparently just for the sake of problem-solving. If that's not curiosity, what is?

The Recognition Problem

Perhaps most unsettling is that octopuses can recognize individual humans. Not humans as a category—specific humans. They'll jet water at a handler they don't like while remaining calm with their favorite keeper. They remember interactions. They hold grudges.

This is where our understanding of intelligence starts to crack. We've built this hierarchy where humans are at the top, then primates, then other mammals. We've measured intelligence based on traits we have: long-term memory, tool use, problem-solving. But octopuses are intelligent in a fundamentally different way. They're short-lived creatures (most species live only 1-2 years) who have developed remarkable cognition without any evolutionary pressure to maintain the complex social structures that drove primate intelligence.

Related to this is a fascinating phenomenon in forest ecosystems: Why Mushrooms Are Nature's Internet: The Wood Wide Web Connecting Every Forest on Earth, which shows how intelligence and communication emerge in totally unexpected places.

What Octopuses Teach Us About Minds

The real gift octopuses give to neuroscience isn't a better understanding of octopuses. It's a better understanding of what intelligence actually is. It's not a single thing you can measure on a scale. It's not consciousness as we experience it. It's not tool use or language or social structure.

Intelligence is the ability to take in information, process it in novel ways, and generate flexible behavioral responses. By that definition, octopuses are geniuses. They're just geniuses in a completely different language than we speak.

When you watch an octopus hunt, problem-solve, and escape confinement—sometimes just for kicks—you're watching a mind that evolved completely independently from yours. That's humbling. It's also profoundly beautiful. It means the universe has found more than one way to think.

And if that's true, then maybe intelligence isn't as special as we thought. Or maybe it's even more special than we realized.