Figure 1.
Phylogenetic tree of anthropoid primates included in study 1 for which data were available on at least two vocalizations from each sex (mean number of vocalizations: females = 38.6, males = 22.1; max: females = 181, males = 155; electronic supplementary material, table S1). Tree was constructed using a consensus phylogeny for all species in our sample from the 10kTrees website (http://10ktrees.fas.harvard.edu/). Sexual dimorphism (male/female) in F0 is shown in the column to the left of species names. Inferred ancestral states were determined using squared change parsimony and are shown at nodes on the tree (coloured to highlight evolutionary trends). (Online version in colour.)