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RE: Tyrannosaurids, skippy, and sterna

Thomas Holtz wrote:

> As for uncinates and air sacs: given the strong evidence (from axial
> pneumatic structures) for some air sac systems throughout Theropoda, one
> doesn't need ossified uncinates to run an air sac system.  

Very true.  Ossified uncinate processes are also absent from some modern
birds.  Screamers (Anhimae; Anseriformes) come to mind.