Figure 5. Thermal and night vision images of bats (circled in red) approaching and passing closely in front of a wind turbine tower.

(A) shows that the bat is difficult to see when approaching the tower using night vision technology. (B–C) demonstrate that the bat is readily visible in front of the tower using night vision technology. In contrast, (D) shows that the bat is readily visible approaching the turbine tower using thermal cameras. (E–F) demonstrate that the bat becomes obscured by the infrared heat signature from the turbine tower.