Bats undergo strict national and European regulations (e.g. 92/43/EEC Habitats Directive and the Agreement on the Conservation of Populations of European Bats – EUROBATS, UNEP 2001).
Many European bats are under threat and some have even become extinct in certain countries. The reasons for this are mainly loss of roosts, loss of feeding areas, increased use of pesticides in agriculture that that kill the insects that the bats depend on for food, increased use of pesticides in building materials, that poison the bats that roost in treated buildings, prejudices against bats and misunderstandings arising from an ignorance of bats.
You can read more interesting facts about bats at EUROBATS Agreement website.
You can download here a pubblication from the Stazione Teriologica Piemontese (in Italian).
Learn more about bats from one of the most prominent expert on bats: Merlin Tuttle.