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. 2020 Aug 3;8:e9477. doi: 10.7717/peerj.9477

Table 2. Behavioural response variables extracted for the primary males in both playback conditions.

Definition
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