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accidental introduction agencies avian diseases bird populations bunchgrass census Coast Guard Common mynas Conant Develop disease problem East Island ecosystems eggs eliminate Ely and Clapp equipment exotic organisms exotic plants extinction finch and Nihoa Fish and Wildlife French Frigate Shoals habitat Hawaii Hawaiian Islands National Hawaiian Islands Passerines Hermes Reef Included in Refuge introduction of exotic invertebrates Islands National Wildlife ISLANDS PASSERINES RECOVERY Kure Atoll landing parties Laysan and Nihoa Laysan Duck Laysan finch Laysan Honeycreeper Laysan Island Laysan millerbird Laysan Rail line transect logistic National Wildlife Refuge native passerines nesting Nihoa finch Nihoa Island Nihoa millerbird Northwestern Hawaiian Islands NWHI P.O. Box PASSERINES RECOVERY PLAN patrol Pearl and Hermes Population Status presence of exotic recovery program Refuge Operations Included rodents RWR RWR RWR seabirds Sincock and Kridler technique threat three species transplanted U.S. Fish unauthorized entry USFWS unpubl vegetation Wildlife Service