Table 1. Proportion of trials with stick transfers (with frequencies in brackets) in each condition.

Species (# of dyads in brackets)	Take	Give	Control 1: No food	Control 2: No victim
Orangutans (29):	41.4 (12)	27.6 (8)	10.4 (3)	0
Orangutans Leipzig (18)	44.4 (8)	44.4 (8)	10.4 (3)	0
Orangutans Pasir Panjang (11)	36.4 (4)	0	0	0
Gorillas (5)	20 (1)	0	0	0
Chimpanzees (27):	3.7 (1)	11.1 (3)	7.4 (2)	3.7 (1)
Chimpanzees Leipzig (15)	0	0	6.7 (1)	0
Chimpanzees Ngamba Island (12)	8.3 (1)	25 (3)	8.3 (1)	8.3 (1)
Bonobos (12)	8.3 (1)	0	0	0