Figure 2.

Relationship between bat sideways speed and crosswind speed. (a) All 5 min or 2.5 min timescale flight segments. (b) The first two flight segments (10 min) of each flight. (c) The last two flight segments (10 min) of each flight. The statistical analysis of the relationship using all the data (a) was not significant, suggesting that bats compensate, at least partially, for wind drift. For the first two flight segments (b), we found a negative relationship indicating overcompensation, whereas for the last two flight segments (c), we found a positive relationship indicating wind drift (see details in the electronic supplementary material, table S1).