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Re: Jeholornis and enantiornithines had one functioning ovary like modern birds



If the loss of a functional  right oviduct is indeed a flight-related
> feature...  does this undermine the hypothesis that terrestrial
> deinonychosaurs and oviraptorosaurs were secondarily flightless?

Complicating factor: kiwi are said to have two functional oviducts, though they only use one at a time to produce an egg of awe-inspiring size.