Fig. 3. (A–C) Average number of crashes and flights through the hole per trial, and (D) the average duration of trials. Values are means +1 S.D. Data are shown for each bat (M1, M2, F1) separately. (A) The landmark is placed next to the hole. In the fly through data F1 failed to find the hole in one trial, which explains the error bar for that bat. (B) The landmark is moved to a position away from the hole. (C) Here there was no landmark available. (D) The average duration of a trial, when the landmark was next to the hole, moved away from the hole, or no landmark available.