Why are there so many butterflies in Southern California right now? – The Pasadena Star

Swarms of butterflies are invading inland sections of Southern California as a result of an unusually heavy migration of a common species making its way from Mexico to the Pacific Northwest to breed, experts say.

About 1 billion butterflies, known as Painted Ladies, are flying at speeds of 20 miles per hour in a northerly direction from the deserts of Mexico to reach breeding grounds in Oregon, said Tom Merriman, a director of Butterfly Farms, a nonprofit in north San Diego County dedicated to restoring the health of butterflies as pollinators.

Many callers have reported being amazed at the volume of these

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