Figure 1
From: Cognitive differences between orang-utan species: a test of the cultural intelligence hypothesis
Overall task performance over the different tasks and subtasks by Pongo pygmaeus and Pongo abelii.
Subjects of P.abelii were significantly more likely to solve a task than P. pygmaeus subjects (Binomial GLMM: B = 1.934, SE = 0.74, z = 2.63, P < 0.01).
