This detailed report (the ‘Main’ link on the webpage) gives an overview of the current state of knowledge on the biology and ecology of Central European bat species in woodland. It is based on an extensive evaluation of the literature in addition to unpublished secondary sources. It illustrates the varying way in which bats use trees for roosting and the importance of understanding the ecology of each species when determining appropriate conservation actions. The importance of damaged trees with cracks, crevices and woodpecker holes is emphasised, as these provide the majority of roosting places for bats.