People eat these things.
From Fisheries Canada: The geoduck (pronounced gooey duck) clam is a member of the Phylum Mollusca... Although a few individuals weigh up to 4.5 kg (10 lbs.), the average whole body wet weight is about 1kg. (2.2 lbs.) with an average shell length of about 195 mm (7 ¾ inches) (Harbo 1997). To the first-time observer, this clam could be considered as rather grotesque because its shell is not capable of encompassing the huge body.
From NOAA.GOV: The geoduck (pronounced gooey-duck) clam caught in Northwest Pacific waters, weighs an average three pounds and yields over a pound of flavorful meat.
Don't know about you, but I've got a sudden hankerin' for some geoduck!