California restored grazing land to tidal marsh; bird density jumped over 12,000%

 California’s initiative to revive the Dutch Slough wetlands has led to a stunning resurgence of Marsh Wren numbers. Recent bird surveys from 2020 to 2025 indicate significant increases in the density of various marsh-dwelling species. This restoration process involved planting indigenous plants and reinstating tidal flows to previous agricultural terrains. While some species saw a decline, overall avian diversity thrived in these rejuvenated areas. California’s initiative to revive the Dutch Slough wetlands has led to a stunning resurgence of Marsh Wren numbers. Recent bird surveys from 2020 to 2025 indicate significant increases in the density of various marsh-dwelling species. This restoration process involved planting indigenous plants and reinstating tidal flows to previous agricultural terrains. While some species saw a decline, overall avian diversity thrived in these rejuvenated areas.