teratorn relationships

[Brian Lauret <zthemanvirus@hotmail.com>]

Hi all

as we probably all know, teratorns have traditionally been linked to 
cathartids. In recent years,however this is far from universally accepted.

For example, I seem to remember Feduccia mentioning in 'The Origin and 
Evolution of Birds' that there were reasons to link teratorns to 
pelecaniforms or storks. Of course, Feduccia did not mention what reasons 
those were (as far as I remember.)

So my question is: has any consensus been reached or persuasive theory been 
made as to what birds teratorns were most closely related to?

P.S. I've seen a height-estimate of 2 meters for Argentavis. Is that 
realistic?

thanks in advance,

Brian