Friends of the Minnesota Valley invites the public to a “Minnesota River Reunion,” July 28, from 1-3 p.m. at Riverside Park in Carver. The event will feature Mike Davis, a freshwater clam ...

They include the Amur River clams from East Asia and the tiny Trochammina hadai—a single-celled amoeba-like organism with a shell—brought in from the seas around Japan. T. hadai and the clams ...