1. Supplementary Figure S1** ** ** **
Postnatal day 8 12 8 12 8 12 8 12 8 12 8 12 8 12 8 12 8 12 8 12
Call type Cx Ts Fs Ha C H Sh D F U b c
Supplementary Figure S1

2. Time (sec)
Frequency (kHz)
Supplementary Figure S2

3. Supplementary Figure S3++ ** *
Supplementary Figure S3

4. Number of selected 2-call combinations
Supplementary Figure S4

5. Supplementary Figure S5
Raw data a
String data b
A340
A338 WT HT
Supplementary Figure S5

6. Supplementary Figure S6

7. Cx Ts H Fs Cx Sh D F D H Sh F Ts U Ha Ha C Fs U C a b
Supplementary Figure S7

8. Complicated call Simple call Ts-F F-Ts C-Fs F-Fs F-F F-Ha Ha-Fs Ts-H
Ha-D
Fs-Ts
Ha-F
H-Fs
Fs-D
Ts-Ts
U-Ts
Fs-C
Sh-Ts
Ts-Cx
Fs-Cx
H-F
D-Fs
Cx-Ts
H-Cx
Sh-Sh
F-Cx
H-Sh
H-H
Cx-Sh
Complicated call
Simple call
Supplementary Figure S8