Detect Clams

You form each hand into a C shape, and rapidly close and open them. For the duration, you can sense the presence and location of clams within 30 feet of you. You also identify the kind of clam (living, dead, somewhere in-between).
The spell can penetrate most barriers, but it is blocked by 1 foot of stone, 1 inch of common metal, a thin sheet of lead, or 3 feet of wood or dirt.