Each year, thousands of monarch butterflies from across the west make their way to the California coast where they spend their winter, including making migratory stops at East Bay parks. For the past two decades, volunteer citizen scientists have been counting them during the Annual Western Monarch Thanksgiving Count, organized by the Xerces Society. Christina Garcia, a naturalist at the East Bay Regional Park District, has been counting butterflies at Ardenwood Historic Farm in Fremont for over 20 years. This…