U.S. News & World Report

Massive Wave of Butterflies Lights up Denver Weather Radar
U.S. News & World Report
A painted lady butterfly flies near daisies in a garden in downtown Denver Wednesday, Oct. 4, 2017. Weather forecasters say that a lacy, cloud-like pattern drifting across a Denver-area radar screen turns out to be a 70-mile-wide wave of butterflies
Massive Kaleidoscope of butterflies blots out radar in DenverWXIA-TV
So many butterflies are migrating through Denver that they triggered weather radarThe Denver Post
Radar Shows Migrating Birds, Er, ButterfliesCBS Local

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