Table 2. Socio-emotional domains, skills, measures, and procedures during the data collection, following the Behavioural, Emotional, and Social Skills Inventory (BESSI). ⁸⁷ .

BESSI domain	Domain definition	Socioemotional/behavioural skill	Procedure	Psychological/behavioural measure	Variable/metric
Social engagement skills	Capacities used to actively engage with other primates	Sociability	SRS Questionnaire	Social responsiveness	Social responsiveness
		Sociability	16PF Questionnaire	Extraversion	Extraversion
		Leadership skill	Behavioural observations	Dominance hierarchy (aggression-related behaviours)	Elo-rating
Cooperation skills	Capacities used to maintain positive social relationships	Social warmth	SRS Questionnaire	Social responsiveness	Social responsiveness
		Social warmth	16PF Questionnaire	Extraversion	Extraversion
				Sensitivity	Sensitivity
				Warmth	Warmth
		Social warmth	Behavioural observations	Other affiliative, other agonistic, social play, socio-sexual and frequency of grooming	Rate of social behaviours
Emotional resilience skills	Capacities used to regulate emotions and moods	Resistance to stress	Behavioural observations	Abnormal behaviours	Rate of abnormal
				Self-directed and displacement behaviours	Rate of anxiety
			16PF Questionnaire	Extraversion	Extraversion
				Emotional stability	Emotional stability
			Welfare Questionnaire	Welfare	Positive indicators
					Negative indicators