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Millions of migrating birds fly over Nebraska and Iowa overnight, marking a peak in spring migration.
Approximately 397 million birds are expected to migrate over Nebraska and Iowa during late-night hours on Monday and Tuesday.
NexRad weather radar detects these high-altitude flocks, which are too high for naked-eye visibility.
The birds rest and feed during the day, with some staying in the region for the summer while others continue northward.
This event marks one of the largest spring migrations recorded this year.
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Millones de aves migratorias vuelan sobre Nebraska y Iowa durante la noche, marcando un pico en la migración de primavera.