In frogs’ croaks, volunteer hears environment’s pulse | Bemidji Pioneer
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In frogs’ croaks, volunteer hears environment’s pulse

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By Dan Olson

MPR New 91.3 FM

LONG LAKE — Half an hour past sunset in rural western Hennepin County, Madeleine Linck strains her ears. She’s listening, believe it or not, for the sounds of courtship.

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Frog courtship, that is.

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