Geoduck. The biological name is Pacific mud clam, also known as emperor clam and goddess clam, and the seafood product name is "geoduck". The two fan shells are the same size, thin and brittle, with serrations, auxiliary shells, and water pipes (also called tentacles) at the front end.

It is a high-end seafood that is highly valued by people in the Far East, including Chinese and Japanese. Originating in the North Pacific coast of the United States and Canada. Because of its large, fleshy red tube that resembles an elephant's trunk (geoduck), it is called "geoduck". The locals don't eat geoducks, so the geoducks are growing well. But since Asian immigrants began to prey on North American geoducks, the local geoducks became endangered. In 1996, artificial breeding began in the Chinese market.