Figure 2

Visualization example: mammal rates. This tree was generated using Bio::Phylo by (i) reading a 3185 taxon phylogeny; (ii) collapsing the major clades; (iii) converting branch-specific speciation rates (read from a separate file, blue indicates low rates, purple and burgundy indicate higher rates) to RGB color codes; (iv) applying these colors to the branches and the average color within each collapsed clade to the triangles (data and use case kindly provided by Mark Pagel and Chris Venditti).