Invasive species are being blamed for the thousands of bird carcasses that have washed ashore Lake Michigan this fall. The annual bird die-off in the northern Wisconsin and Michigan area happens each fall. Over the past 15 years, more than 100,000 birds have been claimed which have been linked to the spread of invasive zebra and quagga mussels. The U.S. Geological Survey has studied mussels for over 20 years and rank them among the most destruction biological invasions in North America. To read more about the bird die-off in the Great Lakes,
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