Table 1.

For each species, list of the dyads in which the subject chose the prosocial token significantly more than chance in the Solitary condition of the Tokens task (Binomial test), with the percentage of prosocial choices made, the p-values for the Binomial test and the results for the Wilcoxon test when comparing the subject's percentage of prosocial choices in the Experimental and Control conditions.

species	subject	partner	percentage of prosocial choices in solitary condition	binomial test (p-value)	Wilcoxon test (experimental versus control condition)
chimpanzees	Fifi	Jahaga	90	<0.001	n = 9, T = 76.5, p = 0.804
	Fifi	Trudi	93	<0.001	n = 7, T = 49, p = 1.000
	Jahaga	Fifi	97	<0.001	n = 1, T = 1.5, p = 1.000
	Jahaga	Trudi	100	<0.001	n = 0, T = 0, p = 1.000
	Lome	Fraukje	100	<0.001	n = 5, T = 20, p = 0.453
	Tai	Fraukje	87	<0.001	n = 5, T = 22.5, p = 0.727
	Trudi	Fifi	100	<0.001	n = 0, T = 0, p = 1.000
bonobos	Fimi	Yasa	90	<0.001	n = 3, T = 7.5, p = 0.625
	Gimena	Yasa	93	<0.001	n = 6, T = 24, p = 0.125
orangutans	Pini	Dokana	90	<0.001	n = 10, T = 90, p = 0.629