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active caves Aerodramus vanikorensis bartschi Aguij Aguon Aquatic and Wildlife birds Black Noddy Cave brown tree snake Cave is located Cave on Aguijan Cave on Guam Cave on Rota Cave on Saipan Cave Swiftlets CC CC CC ceiling Celis Cave censuses chamber Cliff Cave CNMI Commonwealth biologists Conduct counts decline of swiftlets deer hunters determine Division of Aquatic Division of Fish echolocation Engbring Fish and Wildlife foraging Garapan Guam Division Guano Cave guano mining habitat Hour Glass Cave Human disturbance known Landing Cave limestone Mahlac Cave Mariana Islands Population Navy Hill Cave needed Northern Mariana Islands numbers occupied caves P.O. Box pesticides Pillar Cave Potentially Usable Caves problem r\j r\j RECOVERY PLAN Reintroduction secure sinkhole southern Guam species stalactites Swiftlet caves surveyed swiftlet colonies swiftlet populations swiftlets nest Takpochao Cave tangantangan Tin Can Cave Tinian U.S. Fish U.S. Navy Vampire Bat Cave Vanikoro swiftlet Wildlife Resources Wildlife Service