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biological brown-headed cowbird California gnatcatcher California least tern chaparral habitats Chula Vista City of Chula coastal sage scrub Comprehensive Management Plan Conceptual Management Plan cooperative agreements County of San Diego Bay Unit Diego National Wildlife draft Conceptual Management education and interpretation endangered and threatened environmental education Federal Fish and Wildlife funding goal grasslands hunting landowners lands are acquired law enforcement least Bell's vireo monitoring Multiple Species Conservation National Wildlife Refuge native habitats native plant communities Otay-Sweetwater and Vernal prescribed burns proposed Otay-Sweetwater Unit proposed Vernal Pools protect Rancho San Diego rare species Refuge lands Refuge was established Right-of-way riparian woodlands salt ponds San Diego Bay San Diego National San Diego Refuge scrub and chaparral South San Diego Species Conservation Program start-up step-down Refuge management threatened species U.S. Fish Vernal Pools Stewardship Vernal Pools Unit wetlands wildlife habitats wildlife observation wildlife photography Wildlife Refuge System Wildlife Service wildlife-dependent recreational activities