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Counting frogs' croaks will help your neighborhood

...and overall health of the environment. They're very important sentinels," said Sam Droege, a wildlife biologist and amphibian researcher with the U.S. Geological Survey's Patuxent Wildlife Research Center in Laurel, Md. There's...

http://chronicle.augusta.com/stories/2000/03/19/tec_285068.shtml
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