The western monarch butterfly, a migratory population that overwinters on the California coast, has both delighted and befuddled conservationists this year with an apparent surge after last year’s low numbers. According to the Xerces Society for Invertebrate Conservation, more than 200,000 monarchs overwintered in California in 2021. The 2020 Thanksgiving count reached record lows, with a little over . . .

You've reached subscriber-only content

Free 3-day trial

Already a subscriber? Log in here.