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Dec 22, 2014

Did you hear that rumbling?

Photo by Gunnar R. Kramer / Reuters
A Golden-winged Warbler is seen in the Cumberland Mountains of eastern middle Tennessee, USA.   Scientists have said a population of the warblers fled their nesting grounds up to two days before the arrival of a massive storm, apparently alerted to the approaching danger by sounds at frequencies below the range of human hearing.

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