California wetland restoration leads to massive surge in marsh bird density
California has revived the Dutch Slough wetlands, converting former agricultural land back to tidal marsh. The restoration involved planting native vegetation and re-establishing natural tidal flows. Bird surveys from 2020 to 2025 recorded a dramatic increase in the density of marsh-dwelling species, including Marsh Wrens. While some species declined, overall bird diversity improved significantly in the restored habitat.
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