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Re: Gargantuavis neck vertebra

 Uhh...I live in Michigan, and not too long ago, at least 2 species of
 proboscideans co-existed in the same places (mastodon and mammoth).
 that was about 12000 years ago.

To be fair, though, they were clearly separate ecologically, with the mastodon being a specialized browser and the mammoth a grazer or at most a mixed feeder.