Geoducks: The 150-Year-Old Aliens Beneath Our Beaches
The geoduck (pronounced "gooey-duck") is Washington State's most bizarre resident. This massive burrowing clam can weigh over 7 pounds, extend a siphon 3+ feet long, and live for over 150 years. One specimen was aged at 168 years old — meaning it was born before the Civil War.
Found throughout the beaches and tidal flats around Olympia, geoducks are harvested commercially and are considered a delicacy, particularly in Asian markets. But there's something deeply alien about an organism that sits motionless underground for over a century, quietly filtering water through a fleshy tube.
Geoducks can't move once established. They choose their spot as juveniles and commit to it — for life. They're filter feeders, processing thousands of gallons of seawater over their lifespan. In a sense, each geoduck is a living record of everything that's flowed through Puget Sound water for the past century.
Researchers at the Olympia Shellfish Company have found that geoduck shells contain chemical signatures that record water temperature, salinity, and pollution levels year by year — like tree rings for the ocean.
"A geoduck born in 1870 is still alive under the mud near Arcadia Point right now," Captain Ron marvels. "It's been filtering our water, recording our history, for 156 years. That's not a clam. That's a living time capsule."
