Phylogeny of songbirds based on Barker et al 2004 used for phylogenetically-controlled analyses of male share during incubation. In Nexus (=bracket) format. The same phylogeny is also an electronic supplement of the paper as a picture. Barker, F.K., Cibois, A., Schikler, P., Feinstein, J., & Cracraft, J. 2004. Phylogeny and diversification of the largest avian radiation. Proc. Natl. Acad. Sci. USA 101: 11040– 11045.