Some beachcombers were puzzled by the thousands of 10-inch wiggling sausages littering a section of California coast but one researcher knew exactly what they were.

Penis fish. Or, more formally, fat innkeeper worms. Not formal enough? How about the scientific Urechis caupo?

These are a variety of spoonworm, writes Ivan Parr, and they are found in the Pacific Ocean from Southern Oregon to Baja.

This may just be the weirdest thing you've seen today!

Thousands of these marine worms, called fat innkeeper worms—or "penis fish"—washed up on Drake's Beach after a recent storm. ? But why? https://t.co/MwY6xkN3kb pic.twitter.com/vGMpSvGoAT

— Bay Nature magazine (@BayNature) December 11, 2019

The worms create U-shaped burrows in the sand or mud and normally remain sheltered in them.

It’s a fat innkeeper worm livestream! https://t.co/kVYU0E9kyV

— Monterey Bay Aquarium (@MontereyAq) December 16, 2019

Parr speculates that a storm caused this particular colony of innkeepers to be washed from their burrows and strewn across Drakes Beach. While a rare sight, he writes that similar strandings have been reported over the years at Pajaro Dunes, Moss Landing, Bodega Bay and Princeton Harbor.

@ConnerHabib There are a lot of strange worms in California beaches. We dug this guy up on Friday, he's an innkeeper worm, aka penis fish. #innkeeperworm #penisfish #kaebul pic.twitter.com/ptJsmdEajC

— Alejandro Rubio (@jasperridge) May 13, 2019

There is fossil evidence of innkeeper burrows dating back 300 million years, according to Parr. They can live for 25 years.

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