This PDF file includes:

• fig. S1. Percentage variance explained by different variables for (A) western lowland gorillas and (B) central chimpanzees.
  
• fig. S2. Estimated conditional dependence of chimpanzee nest density on proximity to roads.
  
• table S1. Parameter estimates of the top-ranked model used to predict (A) western lowland gorilla and (B) central chimpanzee densities across their range.
  
• table S2. Survey effort for the 82 survey sites included in the analysis.
  
• table S3. Details of the 82 survey sites included in the analysis.

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