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Re: warm-bloodedness

<The prevalent phylogenetic definition of Aves is "the most recent common
ancestor of _Archaeopteryx_ and extant birds, plus all of its descendants".
So, by definition, _Archaeopteryx_ belongs to Aves.>

I like that ambiguous 'and'.  If Archie is on an extinct side branch, he's
still a bird.  That means any number of species not on the direct line to
extant birds could also be in the group, including possibly some without
feathers.  Any chance TR could be among the gang?