Fig. 4

Variation in the percentage of total feeding time spent on each major food type (a) in each month, averaged across years and across study groups, (c) within each year from 1986–2023, averaged across study groups, and (c) within five study groups, averaged within months from November 1999 to October 2009 (i.e., hydrological years 2000–2009) and averaged within months across the five social groups over the same time period (‘Averaged’ panel). Presumed high-energy food types are represented in shades of red and low-energy food types are represented in shades of blue. In (c), white spaces indicate group-months in which we believe that focal animal sampling was too sparse to produce a statistically representative sample of diet composition (n < 75 minutes of feeding observed).