Table 1.

Summary statistics of data from bats released at the cave and at the 3 translocation points (release sites R1, R2 and R3)

CharacteristicCaveR1R2 (crater in)R3 (crater out)
No. of bats151074
Speed, km/h33.5 ± 5.5 (26.8–49.3)35.3 ± 8.2 (26.2–51.7)31.3 ± 2.0 (27.6–34.3)48.1 ± 2.2 (45.9–50.8)
Altitude above ground level, m84.0 ± 27.4 (31.3–122.0)55.1 ± 30.3 (13.7–102.2)51.4 ± 12.9 (27.6–64.7)76.1 ± 20.6 (59.1–103.1)
Flight distance, km15.0 ± 3.2 (7.1–20.6)42.7 ± 15.8 (10.4–62.2)50.5 ± 32.4 (5.5–98.5)51.8 ± 47.0 (5.3–96.0)
Straightness index0.97 ± 0.02 (0.93–0.98)0.85 ± 0.08 (0.7–0.94)0.4 ± 0.18 (0.2–0.7)0.88 ± 0.05 (0.82–0.93)
  • Data for each bat is from the first night only. For each bat, the “speed” was taken as the bat's median speed over the entire commuting flight, and the “altitude” as the median altitude above ground level (maximum speed and altitude were much higher). Numbers represent mean ± SD, computed over the n bats in each column, as well as (in parentheses) the overall range of the median speeds and altitudes for all the n bats. The sample size shown here includes all 36 bats used for analysis (Methods).