Blog: Tens of millions of western birds depend on these two regions during migration
Each spring and fall, an estimated 1 billion birds migrate through the Pacific Flyway, which snakes down from Alaska, along the West Coast of the United States and Mexico, and into South America. … Now new research reveals what has been long-suspected but never confirmed: California’s Central Valley and the Colorado River Delta are hotspots for North America’s migratory landbirds.