Figure 2
From: Wild capuchin monkeys adjust stone tools according to changing nut properties
Experimental set-up.
Five quartzite stones of different weights were presented in random order to the monkeys at a sandstone anvil, which was placed 50 cm from the tools. In the cashew season of 2013 we tested capuchin tool selection for opening dry cashews, in 2014 we tested the selection when opening fresh cashew nuts.
