Presumed Zebra Mussel shell from Montrose Beach (click to see the larger version)

Almost every square foot of Montrose Beach has Zebra or Quagga Mussel shells. These invasive, non-native mollusks have altered the ecology of Lake Michigan and created problems for commerce. It’s hard to believe something so small can create so much trouble for people and the environment. One positive aspect of their presence is that they provide food for several species of duck, like Common Goldeneye and Greater Scaup.

The photo shows a presumed Zebra Mussel shell. The shell is bleached from exposure to the sun and blowing sand, but you can still see how this species got its name. The next time you’re at Montrose Beach, try finding both Zebra and Quagga Mussel shells. The Nature Spot website has a great section on how to identify the two.