Fauna
Invertebrate

Giant Pacific Octopus

Enteroctopus dofleini

Also known as North Pacific Giant Octopus

Giant Pacific octopuses are renowned for their exceptional intelligence, navigating complex underwater mazes and opening sealed jars with ease. They hunt under the cover of darkness along temperate rocky reefs, dragging crabs and mollusks back to secluded dens marked by telltale middens of discarded shells. Females invest their final months of life guarding tens of thousands of translucent eggs, aerating and cleaning them tirelessly without feeding until they perish.

MarineNocturnalIntelligent
Giant Pacific Octopus reference1 / 6
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—observations
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Least ConcernConservation statusIUCN Red List categoriesLCNTVUENCREWEXLeast ConcernRed List categories, explained →
Key facts
Diet & preyDungeness Crab, Red Rock Crab, Pacific Geoduck
Predators
  • Harbor Seal
  • Steller Sea Lion
  • Giant Pacific Sleeper Shark
ThreatsOcean warming, marine pollution, commercial fishing bycatch, and coastal habitat degradation
HabitatsCold temperate coastal waters, kelp forests, rocky reefs, and tidepools down to deep benthos
Life span3–5 years
Classification
  1. OrderOctopoda
  2. FamilyEnteroctopodidae
  3. GenusEnteroctopus
  4. SpeciesEnteroctopus dofleini
Range & activity
N. Pacific

Marine distribution — the ocean basins and seas where the species occurs.

Safe observation
Interaction riskLow
  1. Low
  2. Moderate
  3. High
  4. Very high
Why interaction risk is low
Possesses a powerful beak capable of a painful defensive bite; observe without touching or cornering.
Why it is dangerous
The parrot-like chitinous beak can puncture thick wetsuits and skin, injecting enzymes that cause localized pain and swelling.
How to recognize a risky encounter
Recognized by its massive size, reddish-pink textured mantle, and thick arms lined with two rows of large suckers.
What to do
Maintain a respectful buffer of at least a meter while diving and never reach into dark rock recesses bare-handed.
Responsible observation
  • Look for Dens: Spot them by looking for clean rock crevasses ringed by piles of empty crab carapaces.
  • Night Dives: Dive after dusk when adults leave their crevices to hunt actively over open reefs.
  • Give Space: Avoid blocking cave openings or attempting to grab tentacles, which provokes defensive ink.
Related species
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