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A big female Lake Erie water snake and a territorial male goby. Snake researcher Dr. Rich King caught the snake out of the lake with the goby in its mouth... the snake was swimming toward shore to enjoy its meal. (Photo by Rebecca Williams)

These ten threats to the Great Lakes are complicated. Researchers are finding new ways that nature reacts to them. For example, alien invasive species often compete for food and crowd out the native species. Once a foreign species takes control in an area, there's not much anyone can do to get rid of them. But occasionally, a native species will bite back. The Great Lakes Radio Consortium's Rebecca Williams has that story:

More about the threatened Lake Erie water snake

Producer: Rebecca Williams
Release Date: October 10, 2005
Running Time: 4:27

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