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teratorn relationships

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,