Park Service unravels mysterious jellyfish invasion

SAN FRANCISCO (KGO) -- The National Park Service thinks it's unraveled the mystery of last weekend's jellyfish invasion.

More than 10,000 moon jellies came ashore Saturday morning. Marine biologists with the park service say it likely happened because of a large ocean swell, combined with a surge in the jellyfish population.

Most of the creatures washed back out to sea by a high tide on Sunday, but a few hundred remain on the beach.

Niologists say the jellyfish posed no danger.

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