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Re: Hoatzin & Archaeopteryx

I'm not sure what you mean here.  If "bird" is defined to include
dromaeosaurs and oviraptorosaurs, _Archaeopteryx_ is still the oldest
undisputed bird.  I don't know of any others.

There are Kimmeridgian and perhaps Middle Jurassic dromaeosaurs (and troodontids).

As for _Epidendrosaurus_, you're assuming a Middle
Jurassic age for this critter; I think this will change.

Right. I don't know what the age is based upon...