Arithmetic-Like Reasoning in Wild Vervet Monkeys: A Demonstration of Cost-Benefit Calculation in Foraging
Figure 2
Subtraction sequences for the “1−0” (a) and “2−1” (b) conditions. The upper row shows the actual movement of the cup and bread pieces, and the two lower rows indicate the hypothesized view (1, 2) and representation (3, 4) of bread pieces in the monkey’s mind.
