Fig. 4From: Development of foraging skills in two orangutan populations: needing to learn or needing to grow?Dietary complexity: Distribution of the different processing steps in percent of the total diet (for the food items that form the top 90Â % of the total diet) of 4 adult females at Tuanan and Suaq each. The red line indicates the site frequency ratio of each given processing step (log (frequeny at Tuanan/frequency at Suaq +1))Back to article page