0.55 Sue Boinski Robert P. Quatrone Hilary Swartz, Substrate and Tool Use by Brown Capuchins in Suriname: Ecological Contexts and Cognitive Bases, American Anthropologist, 2000.

{ human behavior evolution social }	0.55
{ university press american pp }	0.08
{ forest plant plants species }	0.08
{ number data group table }	0.06