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St. Paul, Minn.

The mystery of the disappearing frogs

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Tree Frog
A tree frog sits on a branch in Owings, Maryland. The state of Maryland is home to several species of frogs each of which have their own distinct call or sound that they produce.
Photo by Mark Wilson/Getty Images
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Frogs
A tree frog sits on a branch in Owings, Maryland. The state of Maryland is home to several species of frogs each of which have their own distinct call or sound that they produce.
Photo by Mark Wilson/Getty Images