Fig. 3
From: Wild and zoo-housed orangutans differ in how they explore objects
(a) Age at first occurrence of exploratory actions. Age of first occurrence of all exploratory actions in wild and zoo-housed orangutans. Note that the corresponding analysis (see above) only included actions that were performed by individuals in both settings. Dots surrounded by circles indicate exploratory actions that include the use of a tool. Dashed lines connect the same respective exploratory action. b) Age trajectories for repertoires of exploratory actions. Cumulative number of exploratory actions as a function of age in wild (purple) and zoo-housed orangutans (yellow). Solid lines depict the fitted model and dashed lines indicate the respective asymptote, i.e., the estimated total repertoire size at adult age.
