More taxa, more characters: the hoatzin problem is still unresolved.

@article{Sorenson2003MoreTM,
  title={More taxa, more characters: the hoatzin problem is still unresolved.},
  author={Michael D. Sorenson and Elen Oneal and Jaime Garc{\'i}a-Moreno and David P. Mindell},
  journal={Molecular biology and evolution},
  year={2003},
  volume={20 9},
  pages={
          1484-98
        }
}
The apparently rapid and ancient diversification of many avian orders complicates the resolution of their relationships using molecular data. Recent studies based on complete mitochondrial DNA (mtDNA) sequences or shorter lengths of nuclear sequence have helped corroborate the basic structure of the avian tree (e.g., a basal split between Paleognathae and Neognathae) but have made relatively little progress in resolving relationships among the many orders within Neoaves. We explored the… 

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