Rare, deep-sea encounter: California scientists observe 'extraordinary' seven

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California scientists captured rare footage of a seven-arm octopus eating a jellyfish.

Almost a half-mile below the surface of Monterey Bay, California scientists recently recorded rare footage of a seven-arm octopus — only the fourth time the same research team has spotted the species in about four decades.

In a new video posted online , scientists with the Monterey Bay Aquarium Research Institute shared footage of the giant octopus eating and holding onto a smaller red helmet jellyfish, a bioluminescent creature known to avoid sunlight.

The last time these researchers spotted this type of “extraordinary octopus,” the creature was also holding part of a jellyfish, which at