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This collection comprises authoritative species range maps and habitat suitability data from the California Wildlife Habitat Relationships (CWHR) system. It covers geographic distribution data for a wide variety of bird species native to California, formatted as vector polygons for GIS analysis. These datasets are designed to be integrated with environmental and land use layers within the established CWHR predictive modeling framework. They provide the foundational spatial data required by state agencies and conservation planners for habitat suitability modeling, conservation impact assessments, and land use planning specific to California's ecosystems.