Table 1.

Sound parameters of vocalizations from awakening pipistrelle bats (second order means ± s.d.).

	mean ± s.d.	n (sound files)	n (vocalizations)
highest frequency	29.8 ± 3.9 kHz	8	51
frequency with maximum amplitude	15.1 ± 2.6 kHz	8	51
lowest frequency	3.9 ± 1.6 kHz	8	51
duration	0.78 ± 0.24 s	10	61
interval (onset to onset)	2.25 ± 0.54 s	9	60
trailing tonal calls	1.9 ± 0.6	7	50