Table 1.

Developmental changes of the short call in start frequency (SF), end frequency (EF), peak frequency (PF), call duration (CD) and number of harmonics (NH) in Myotis emarginatus pup with mean ± SE. n, number of bat pups which were recorded

Vocal features	Age
	1st week old		2nd weeks old		3rd weeks old		4th weeks old
	1 day	4 days	8 days	12 days	16 days	20 days	27 days
	(n = 5)	(n = 3)	(n = 17)	(n = 6)	(n = 13)	(n = 5)	(n = 4)
SF (kHz)	29.38 ± 2.07	41.59 ± 1.89	62.94 ± 2.12	95.82 ± 3.90	112.32 ± 3.32	132.80 ± 2.61	128.92 ± 3.87
EF (kHz)	18.24 ± 2.20	20.89 ± 0.95	27.71 ± 0.83	39.54 ± 0.90	41.31 ± 0.93	43.05 ± 1.36	40.40 ± 1.08
PF (kHz)	25.37 ± 2.00	36.69 ± 0.68	49.75 ± 1.75	77.40 ± 5.20	82.87 ± 1.72	88.73 ± 1.64	89.93 ± 3.06
CD (ms)	7.56 ± 0.05	4.28 ± 0.31	3.42 ± 0.18	2.38 ± 0.47	2.78 ± 0.13	2.48 ± 0.17	2.23 ± 0.18
NH	4	3–4	2–3	2	1–2	1	1