Table 2.

Definition of the vocal and event terms used

Term	Definition	Includes
Utterance	A bout of vocal emission (single units and sequences)	Single vocal unit: 1 or more vocal units of the same call type, with less than 2-s between units (e.g., a grunt or a series of grunts)
		Sequence: a combination of at least two successive different vocal units with less than 1-s between call types (e.g., grunt + bark)
Event	Context or situation in which a vocal utterance was emitted (i.e., activity, social interaction, environmental change)	Single event: only one event occurred during utterance emission
		Concomitant event: numerous events occurred during utterance emission, either simultaneously or in rapid sequential order or both.