How smart is a giant Pacific octopus? Giant Pacific octopuses are smart: they can learn to open jars. A giant Pacific octopus has a well-developed brain. National Wildlife magazine reported that scientists believe octopuses are more intelligent than any fish, though not as smart as most mammals. Most observations of octopus intelligence have come from captivity, because divers cannot stay down long enough to watch complex behavior in the wild. Giant Pacific octopuses are hard to study because they live short lives and keep out of sight.

Giant Pacific octopuses can tell individual people apart. In a 2010 study, eight giant Pacific octopuses were each exposed to two unfamiliar people over two weeks. One person fed them, and the other touched them with a bristly stick. By the end of that 2010 study, the octopuses behaved differently toward the two people: a dark eyebar pattern, arm reaching and funnel direction all differed significantly. In the 2010 study, the four larger octopuses changed their breathing rate between the two people, but the four smaller octopuses did not.

A giant Pacific octopus named Pandora opened her first puzzle jar in 15 minutes. Later jars took her about two minutes on average. Unscrewing jars took the octopuses tested a long while to learn, but nearly all of them succeeded in the end. Researchers report that octopuses explore and may show motor play, such as repeatedly handling objects. Aquarium researchers suggest that individual giant Pacific octopuses have different temperaments, which could explain why they handled toys for different lengths of time.

This finding comes from common octopuses, not from the giant Pacific octopus. In a 2020 study of common octopuses, 5 of 6 learned which way to push one arm through a maze to reach food, even without seeing the arm or the food. The 2020 maze study found that octopus learning happens in the brain and is then made available to each arm. The common octopus has over 500 million neurons, similar in number to a dog, and over two thirds of them are in its arms and body rather than its central brain.

This finding comes from a relative, not from the giant Pacific octopus. In a lab study, Octopus insularis alternated between quiet sleep, with pale skin and closed pupils, and short active sleep, with changing skin patterns and rapid eye movements, lasting about 40 seconds.

The veined octopus, a relative, carries halves of coconut shell under its body and uses them as portable shelter. To study the veined octopus's coconut carrying, researchers spent 500 diver hours watching and observed 20 veined octopuses. Among invertebrates, which are animals without backbones, only octopuses and a few insects are known to use tools, says the Natural History Museum.

The suckers on a giant Pacific octopus's arms help it grip things and taste them. Each sucker on an octopus's arm may have about 10,000 neurons, or nerve cells. They handle taste and touch.

A giant Pacific octopus has sharp vision. Cephalopod eyes can perceive polarized light, light waves vibrating in particular directions, from different directions. Cephalopods, including octopuses, appear to be colorblind, except for a few deep-sea species.

An octopus's skin has a top layer of pigment organs called chromatophores that make its colors. A giant Pacific octopus can change the color of its skin to blend in. It can also change the texture of its skin, raising bumps to match its surroundings.

A giant Pacific octopus has eight arms. It can squeeze through a very small space. The only hard part of its body is its beak, which looks like a parrot's.

The giant Pacific octopus is the largest kind of octopus in the world. As of November 2026, a full-grown one often weighs 50 pounds (23 kg) or more. As of November 2026, the Seattle Aquarium says adults weigh 40 to 100 pounds, with a relaxed tip-to-tip span of 12 to 14 feet. Monterey Bay Aquarium and the Alaska Wildlife Alliance both say the heaviest on record weighed 200 pounds and measured nearly 20 feet across. National Geographic and National Wildlife magazine both report a record of more than 600 pounds and about 30 feet across, a much larger figure than the 200 pounds other sources give.

Giant Pacific octopuses live from southern California north to Alaska and the Bering Sea, and across the Pacific to Japan. As of November 2026, reference guides disagree about how deep giant Pacific octopuses live. One says to 750 meters, another to 1,000 meters, and others to 1,500 meters.

A giant Pacific octopus lives about 3 to 5 years. Scientists age octopuses by counting growth rings in hard parts such as beaks and stylets. The rings mark days, not years. A female breeds only once in her life. Giant Pacific octopuses breed near the end of their lives and die not long after.

A mother giant Pacific octopus lays her eggs in a den and stays with them, usually not eating, until they hatch. A female lays about 20,000 to 100,000 eggs. The eggs take roughly 5 months to a year to hatch, depending on the water temperature. A baby is about the size of a grain of rice when it hatches. After hatching, the tiny octopuses drift near the ocean surface as plankton. About one percent of giant Pacific octopus larvae survive their drifting plankton stage.

Words to know

• stylets: hard inner parts
• polarized: directed light
• temperaments: personality styles
• plankton: drifting life