|Sunday, Feb 26, 2012 - 9:00 AM
"Pine Butterflies/Radon/Open Water Swimming"
A rare population explosion of pine butterflies fills the Malheur National Forest with a fluttering snowstorm in August. The outbreak may occur for two to three years - with the caterpillars eating needles off 250,000 acres of trees - then disappear for up to three decades. G
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