| Behaviour |
|
| Feeding |
Handling or consuming food items |
| Resting |
Prolonged stationary position, with or without eyes closed |
| Grooming |
Auto- or allo-grooming (giver and receiver identity were collected) |
| Social |
Mating, play, aggressive, or parental behaviour |
| Moving |
Travel within or between trees (at least 2 metres) |
| Vigilance |
Scanning the environment, head rotating by at least 45° (Koenig, 1998) |
| Other |
Behaviour not classified into any of the above categories |
| Body position |
| Hanging |
Suspended in the air, grabbing a branch or a tree part with at least one arm |
| Sitting/Lying down |
Sitting on a branch or on the ground / Resting in horizontal position |
| Gaze direction (staring at a specific location/direction/animal/person for ≥ 3s) |
| Speaker |
Staring in the direction of the speaker |
| Ground |
Looking towards or actively scanning the ground |
| Canopy |
Looking around, or towards a specific location in the trees at the same elevation as the animal location |
| Sky |
Looking up at the sky |
| Group member |
Looking at a group member (the identity of the receiver was collected) |
| Observer |
Looking at the observer |
| Elsewhere |
Looking in a direction that cannot be classified into any of the above categories |
| Nowhere |
Resting with eyes closed |
| Other measurements |
| Elevation (m) |
Height of the animal in relation to the ground |
| Proximity (m) |
Distance between the two focal individuals (paired male and female) |
| Defaecation/Urination |
Exuding faeces and/or urine |
| Dropping branch |
Individuals shaking branch(es) so as it ended up falling on the ground |
| Latency of first look towards the speaker (s) |
Time elapsed between stimulus onset and first look towards the speaker |
| Duration of first look towards the speaker (s) |
Duration of first gaze directed towards the speaker location |
