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California’s Missing Monarchs: Scientists Work to Reverse a Worrisome Trend

Dangling tree branches covered in orange monarch butterflies
For residents of many coastal California towns, the colorful Monarch butterfly (Danaus plexippus plexippus) migration has been a welcome wintertime sight for generations. The beautiful and distinctive orange-and-black patterned insects have historically congregated at more than 400 known sites in the Golden State.