Monarchs decreased across California last year but rose by about a third in West Marin, according to the Xerces Society for Invertebrate Conservation. During its annual Thanksgiving count, around 60 monarchs were spotted in Stinson Beach and roughly 3,000 were counted in Bolinas, many at a grove of eucalyptus trees that has been targeted for removal. Monarchs arrived at the site early, then bounced back and forth to two other sites in town and stayed…