Table 4 Physical properties (indentation hardness and elastic modulus) of the food resources processed with stone tools in each area and the average stone tool weight the capuchin monkeys use to process each resource type.

Resource	N	Indentation hardness (MPa) mean ± SD	Reduced Elastic Modulus (GPa) mean ± SD	Length (mm) Mean ± SD	Avg stone tool weight (g)
Anacardium	33	3.40 ± 5.53	0.0642 ± 0.092	37.79 ± 8.05	195.8 (n = 34)
Dry nut	11	8.56 ± 7.25	0.1559 ± 0.113	32.55 ± 2.32
SCaNP	5	13.72 ± 7.68	0.2472 ± 0.096	32.28 ± 1.1	186.9 (n = 12)
SCoNP	6	4.27 ± 3.03	0.0799 ± 0.052	32.78 ± 3.11	n.a
Fresh nut	22	0.81 ± 0.78	0.0184 ± 0.044	40.41 ± 8.65
SCaNP	9	1.28 ± 1.03	0.0206 ± 0.017	49.78 ± 3.92	204.8 (n = 22)
SCoNP	13	0.49 ± 0.28	0.0168 ± 0.044	33.92 ± 3.04	n.a
Attalea
CVNP	21	104.68 ± 91.06	3.7363 ± 3.207	63.33 ± 5.2	1723.4 (n = 134)
Hymenaea^#	21	36.25 ± 16.72	0.8845 ± 0.457	–	537.9 (n = 44)
CVNP	5	24.08 ± 4.56	0.5550 ± 0.093	–	1011.2 (n = 4)
SCaNP*	7	35.12 ± 11.54	1.1014 ± 0.513	–	249.2 (n = 14)
SCoNP	9	42.54 ± 20.9	0.8622 ± 0.446	–	353.3 (n = 26)
Manihot	72	118.24 ± 73.29	2.115 ± 2.379	16.42 ± 1.27	195.3 (n = 50)
SCaNP	43	83.58 ± 47.83	2.1973 ± 2.954	15.73 ± 1.07	169.3 (n = 30)
SCoNP	29	169.64 ± 74.88	1.9931 ± 1.113	17.30 ± 0.93	221.4 (n = 20)
Buchenavia
SCoNP	10	51.52 ± 32.04	0.7732 ± 0.562	16.09 ± 1.54	342 (n = 18)

Some values are not available (n.a.) because the monkeys were not observed to process the resource with stone tools in that population.
*Data on stone tool weight for Hymenaea in SCaNP from³¹.
^#The Hymenaea species at SCoNP is H. martiana, and in SCaNP is H. courbaril. The species sampled at CVNP is unknown, as there are two similar species in the area, H. courbaril and H. stignocarpa³². We compared them at the genus level in this work. The length value is not shown for Hymenaea because the samples were often fragmented, not allowing the measure of the original length.

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