Figure 1
From: Learning curves and teaching when acquiring nut-cracking in humans and chimpanzees
Learning curves for the ‘number of nuts cracked per minute’ in Taï chimpanzees and Mbendjele foragers; (a) when considering absolute age (above) and (b) when considering relative age whereby 1.0 corresponds to the population-specific age of first reproduction. Indicated are the fitted model and its confidence intervals. For the plot age was binned (bin width: 0.1 year), and the number nuts cracked per minute was averaged per age bin. Symbol area represents the total observation time per age bin (0.1 to 15.8 hours).
