Re: Coiled trachea

["Jaime Headden" <jaemei@hotmail.com>]

<It struck me recently that another animal group that had (perhaps) the 
functional equivilent of tracheal loops were the crested, although their 
loops were piled on top of their heads rather than contained within the 
chest. Although many folks have suggested that hadrosaurs used their 
crests in vocalization, I haven't heard any discussion of those 
structures as possibly homologous to the internal tracheal loops of 
birds.>

Longer trachea to enhance vocalization? Yes, this has been discussed, 
but never presented in just this way.

Jaime A. Headden

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