Monarch butterflies have been on the decline for years, and in the winter of 2020 fewer than 2,000 were observed across the West Coast. But this year was different. A boom of monarch butterflies flooded California’s seaside towns, with more than 247,000 counted in 2022, according to the Xerces Society for Invertebrate Conservation. Take a tour of a monarch butterfly Sanctuary in Pacific Grove in the midst of their migration along the California coast.