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Monarch Butterfly migration is underway across Pennsylvania - Gettysburg Connection

Cooler temperatures, shorter days, and blooming goldenrods and asters mark the start of one of nature’s most remarkable spectacles: the monarch butterfly migration. Each September, monarchs (Danaus plexippus) pass through Pennsylvania on their journey of up to 3,000 miles to wintering grounds in Mexico’s Oyamel fir forests. Unlike the summer generations, which live just four
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Gettysburg Connection broke the news in Gettysburg, United States on Monday, September 15, 2025.
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