Table 2. Measures of lateral biases in mother and infant Barbary macaques.

	Maternal cradling					Infant retrieval
Subject	Right (bouts)	Left (bouts)	Laterality index	z-score	Preference	Right (bouts)	Left (bouts)	Laterality Index	z-score	Preference
Budda	101	34	0.50	5.68	Right	13	11	0.08	0.2	Ambi
Funny	51	77	−0.20	−2.21	Left	11	11	0.00	0	Ambi
Katrina	5	27	−0.69	−3.71	Left	3	4	−0.14	a	a
Last	11	51	−0.65	−4.95	Left	11	7	0.22	0.71	Ambi
Mirror	49	71	−0.18	−1.92	Ambi	18	12	0.20	0.91	Ambi
Vanda	98	16	0.72	7.59	Right	14	14	0.00	0	Ambi
Violetta	74	27	0.47	4.58	Right	24	28	−0.08	−0.42	Ambi

Notes.

^aExcluded from the individual-level statistical analysis due to data deficiency.

Ambi: −1.96 < z-score < 1.96; Left: z-score < −1.96; Right: z-score > 1.96.