We left Montreal Friday morning and a couple of hours later left Canada near Rouses Point, New York. After exiting the U.S. border station, we took Route 2 that crosses Lake Champlain into Vermont. While still on the bridge, we stopped for lunch at a convenient parking lot facing north.
After I finished my sandwich, I had my customary quick walk along the shore of the lake to check out the local mollusk fauna. These small mussels were abundant on the rocks at the edge of the water.
If I am not mistaken, they are the infamous zebra mussels (Dreissena polymorpha) that have been present in Lake Champlain at least since 1993.
These mussels are native to southeast Europe. They were 1st seen in North America in 1988. Despite its small size, the zebra mussel is a nuisance species, because it is invasive and often present abundantly (more info from the USDA).