Swarms of dragonflies appearing on weather radar

A Dragonfly hovers in mid air with its legs carefully folded underneath as it searches for food at the Paynes Prarie Wildlife Preserve near Gainesville ,Fla., Tuesday, March 6, 2012. Dragonflies are thought to have been around for 300 million years. The wings of a Dragonfly move independently, so they can fly forward or backward. (AP Photo/Phil Sandlin)
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WAYNESBORO, Pa. (AP) -- Swarms of dragonflies are taking over several western Pennsylvania communities and have even showed up on weather radar.

WTAE-TV reports that meteorologists with the National Weather Service in Cleveland spotted an unusually large blob on their radar earlier this week. It turned out to be dragonflies.

Entomologists say the swarms of dragonflies are quite common, and usually happen when they are migrating south to find warmer weather as winter approaches.

The swarms have also been reported in Indiana, Ohio and Virginia.

A similar phenomenon occurred earlier this year when a massive bloom of ladybugs was detected by radar in the area of San Diego.

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