Bootstrap consensus tree with molecular backbone constraint for all extant taxa. Relationships between extant species of Megapodiidae were constrained based on a recent molecular phylogeny of that family [4], and all other extant non-megapode taxa as described by Worthy et al. [21]. Relationships of the fossil taxa were unconstrained, and they were therefore free to move to their optimal positions around this framework. *Extinct taxon. Tree statistics: length, 1453; consistency index, 0.27; homoplasy index, 0.73; retention index, 0.63). Numbers are bootstrap probability values expressed as a percentage.