So Bengal B, I see you're a fan of the Evergreen State College Geoducks this is their mascot, "Speedy" Despite the name, a geoduck is not a duck, nor is it a geode. In fact, it’s pronounced like gooey-duck. The geoduck is the world’s largest burrowing clam. The Puget Sound geoduck weighs in at over two pounds on average. It’s so large, it can’t fit into its own shell.