The World's Largest Clam
The geoduck or gooyduck is the largest species of clams on the face of the earth. The clam grows to around 15 to 20cm but it's long siphon can reach 1 metre in length. It weighs between 0.5 and 1.5 kilograms but can grow much larger.
The organism, which can live well over 100 years is a delicacy in China and Japan where they are often eaten raw.
There are more photos here and anyway that comments on it looking like a you-know-what is just dirty!

There's a Discovery Channel "Dirty Jobs" episode about these. Lots o' phallic jokes ensue. Cheers.
Posted by: JasonSTL | Tuesday, February 26, 2008 at 10:43 PM
But it really DOES look like a you-know-what.
Posted by: Debster | Wednesday, February 27, 2008 at 10:44 AM
So what about the Giant Clam then??
Posted by: Christian | Wednesday, February 27, 2008 at 01:01 PM
It look like a penis!!
Posted by: Tammy | Sunday, March 02, 2008 at 01:50 AM
Just checked. The giant clam is bigger, up to 4 feet across.
Posted by: Roy | Sunday, March 02, 2008 at 09:46 PM