The Czech Bat Conservation Trust (CESON), hosted by the National Museum Prague, was established in 1991 to improve co-operation between professionals and amateurs, dealing with bats.
The non-governmental organisation's mission is to co-ordinate conservation of and research in bats and their habitats. Among the technical and educational activities, the Bat Population Monitoring in the Czech Republic project and organizing the European Nat Nights should be mentioned. In 2008, more than 700 wintering sites (hibernacula) and almost 200 summer colonies were checked on the whole territory of the Czech Republic du-ring the monitoring scheme. Ten colonies with high species diversity and well-preserved habitats are monitored by detectoring. They are as follows: Český kras/Bohemian Karst, Český ráj/Bohemian Paradise, Broumov Area, Třeboň Basin, Litovelské Pomoraví/Litovel Morava River Basin, Poodří/Odra River Basin, Moravský kras/Moravian Karst Protected Landscape Areas (PLAs), Dolní Morava/Lower Morava River UNESCO Biosphere Reserve, Šumava/Bohemian Forest and Podyjí/Thaya River Basin National Parks (NPs). Netting is regularly carried out at nine sites which were chosen using the same criteria, with special attention to research tradition. The sites include the Ice Cave pseudokarst system in the Podyjí/Thaya River Basin NP, the Na Turoldu Cave, the Soutěska pod Děvínem/Defile below Děvín Hill site, a cave on Bezděz Hill, entrances to caves in the Štraněk National Nature Reserve, the Hranice Abyss, the Vápenice and Basa Caves, the Kateřina Cave and the Chýnov Cave. Greater Mouse-eared Bats (Myotis myotis) near the city of Mladá Boleslav and Alcathoe´s Whiskered Bats (Myotis alcathoe) in the Křivoklát Area PLA have been monitored by telemetry. Due to the CESON members, the Czech Republic has been among the European countries pioneering in organising the European Bat Nights (since 1997). The event focuses on the general public which can meet the current know-ledge of bat bionomics.