Story perspectives

Rare Seven-Arm Octopus Spotted Feeding in Monterey Bay

12/13/2025

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Summary

Story summary

On November 6, 2025, researchers from the Monterey Bay Aquarium Research Institute (MBARI) observed a seven-arm octopus (Haliphron atlanticus) at 700 meters depth in Monterey Bay, California.
It marks the fourth sighting of the species in four decades.
Video shows the octopus feeding on a red helmet jellyfish, a bioluminescent creature.
Senior scientist Steven Haddock of MBARI notes the sighting confirms earlier observations, showing the octopus ate a different jellyfish.

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Story summary

On November 6, 2025, researchers from the Monterey Bay Aquarium Research Institute (MBARI) observed a seven-arm octopus (Haliphron atlanticus) at 700 meters depth in Monterey Bay, California.
It marks the fourth sighting of the species in four decades.
Video shows the octopus feeding on a red helmet jellyfish, a bioluminescent creature.
Senior scientist Steven Haddock of MBARI notes the sighting confirms earlier observations, showing the octopus ate a different jellyfish.