The horseshoes usually hang free, wrapping themselves into their wings. This allows for their immediate identification and ease up counting their numbers. Other bat species often cluster tightly, often in large numbers (photo 1). When they cuddle and form a large group, counting of them is difficult. In such situations the best method is to take a photograph, and count the specimens after return. This method has another advantage, the researcher stays shorter time in the colony, and the bats are less disturbed.

A few participants, who will give most exact number, as compared to the results of the monitoring, will receive gadgets promoting the Podkowiec+ project.