zebra mussels

Washington state to use dog to detect invasive mussels on boats

This photo provided by the U.S. Department of Agriculture shows a group of zebra mussels. Government officials are cracking down…

7 years ago

Lake Superior No Longer the Clearest of the Great Lakes

Photo: Lake Superior, seen from the Park Point beach in Duluth in August. Many people who've spent much time around…

7 years ago