The activities on the project were conditioned both by the implementation of financial resources and by the problems with the COVID virus pandemic. This caused the impossibility of holding a workshop and a regional conference as well as the International Bat Night.

Fieldwork went according to the plan, but there were difficulties due to the pandemic. During the field work, 35 underground structures (caves, pits, artificial underground) were inspected.

Car transects were made in parts of Bosnia and Herzegovina along the border with neighbouring countries (Serbia, Croatia, and Montenegro) from where we have not had any data so far. A mixed maternity colony of R. ferrumequinum and R euryale was found in the Austro-Hungarian fortress of Strač near Trebinje, which opens a new field of cross-border research of Austro-Hungarian fortresses in the border area of Bosnia and Herzegovina and Montenegro. We found four colonies of bats in the Uvir cave: Rhinolophus ferrumequinim, R. euryale, Miniopterus schreibersii and Barbastella barbastellus. The colony of B. barbastellus is the largest colony of this species (about 200 animals) in the former Yugoslavia.

We have strengthened contacts with local speleological and mountaineering societies in the towns of Trebinje, Grahovo and Drvar.