Insider Speaker Series: An Ideal Home for Monarchs
The western monarch is arguably one of the most recognizable butterflies in California.
Hundreds of thousands of monarch butterflies (Danaus plexippus) rely on the forested groves of the Pacific coast stretching from Mendocino County, California to Baja to overwinter. In the 1980s, an estimated 4.5 million butterflies migrated to the coast annually. However, by the mid-2010s, the population declined to 200-300 thousand butterflies. And in both 2018 and 2019, volunteers counted under 30,000 monarchs — less than 1% of the population’s historic size. In 2020, volunteers counted less than 2,000 monarchs — that’s less than 0.01% of the historic size. While the 2021 count is overwhelmingly positive, the population has still plummeted from historic numbers.
The California state park system holds critical habitat for western monarchs – providing shelter and protection for this iconic species. State parks are home to key monarch overwintering sites and located along important migration routes. These places provide the appropriate microclimate conditions for clustering, as well as providing nectar resources and minimizing stressors to the butterflies.
Over the past year, California State Parks Foundation has invested in helping specific California state parks with their Monarch Butterfly Overwintering Site Management Plans. This year, the focus will be on creating the ideal home for monarch butterflies in California state parks.
Join California State Parks Foundation and experts to talk about what it takes to make an ideal home for monarch butterflies.
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