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Re: Ornithurine diversity

...and possibly why competition/predation is a better explanation
for enantiornithine extinction in some ecosystems?

How could it possibly do that? It's Campanian, at least 10 million years older than the K-Pg boundary, and it's just a few coracoids. And last but not least, the complete absence of enantiornithean coracoids (so far) makes it impossible to see how the diversity and abundance of eu- vs enantiornitheans changed over time.