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Fig. 3. (AC) 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.