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Wow. A type of clam. Very interesting. [en.wikipedia.org]
Funny thing is in that article it states that Chinese consider it an aphrodisiac due to its phallic resemblance. haha

I wonder if these could be grown in a tank.

Spelling error?

It's pronounced "Gooey-duck," I learned when I moved to Washington State from Michigan. Similar-sounding rivers and creeks are confusing to this Midwesterner:

Chiwawa River
Chiwaukum Creek

Skykomish River
Snohomish River
Snoqualmie River
Stillaguamish River

Because the common name is derived from a Lushootseed (Nisqually) word gʷídəq. i hope that clears it up.