There's an associated website at http://birdtree.org/ http://birdtree.org/ . They don't seem to be providing the actual phylogenetic tree data (there's a crypt

There's an associated website at http://birdtree.org/ http://birdtree.org/ . They don't seem to be providing the actual phylogenetic tree data (there's a cryptic note "More information will be made available here with the print publication of the study"), but there is a link to a higher-resolution PDF: http://litoria.eeb.yale.edu/bird-tree/images/BirdTreeHighRes3.pdf http://litoria.eeb.yale.edu/bird-tree/images/BirdTreeHighRes... You can also download the supplementary PDF at http://www.nature.com/nature/journal/vaop/ncurrent/extref/nature11631-s1.pdf http://www.nature.com/nature/journal/vaop/ncurrent/extref/na... which has a lot more detail and some pretty pictures towards the bottom.