Table 1. Composition of study groups at the Mo Singto-Klong E-Tau research area (August 2014).

Group	N individuals	Group composition	Tested	Song provider for
A*	3	2AM, 1AF	–	group H
B*	5	2AM, 1AF, 1JF, 1I?	yes	–
BD	3	1AM, 1AF, 1I?	–	–
C	3	1AM, 1AF, 1I?	–	–
E	3	1AM, 1AF, 1JM	–	–
H†	4	1AM, 1AF, 1JF, 1I?	yes	–
M	5	1AM, 1AF, 1SAF, 1JM, 1I?	yes	group R
N*	6	2AM, 1AF, 1SAM, 1JF, 1I?	yes	group M
NOS*	5	2AM, 1AF, 1J?, 1I?	–	–
R	4	1AM, 1AF, 1AF, 1I?	yes	–
S	3	1AM, 1AF, 1JM	–	group W
T	5	1AM, 1AF, 1SAM, 1JM, 1I?	–	group B
W*	4	2AM, 1AF, 1I?	yes	group N

Notes:

^*Multi-male group; M, male; F, female, ?, sex unknown; A, Adult (age > 8 years); SA, sub-adult (5–8 years); J, juvenile (2–5 years); I, infant (<2 years). yes, tested group; -, group not tested.

^†No data on latency and duration of first look to speaker due to technical problems (duet playback: female filmed erroneously; predator playback: male moved out of sight).