Yep, that’s a clam. Or perhaps a mussel, I dimly recall that freshwater mussels resemble clams. While Henbogle is in Midcoast Maine, we are quite a distance from the shore, so I suspect this is a freshwater clam or mussel. But I am by no means an expert on clam identification. Eating, however, is another matter.
And yes, this clam is alive, sort of. See the innards? That’s the foot, the light colored area on the left, and the neck, the dark circular area in the center. I think. Most of what I can recall of clam anatomy comes from eating steamers, dipped in butter. Yum.
How did it get to Henbogle? I suspect a seagull dropped it. Perhaps it is from nearby Merrymeeting Bay. Huh.