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What is a bird?

How about this:

clade Ornithes: the most recent common ancestor of all dinosauromorphs
which are capable of powered flight, plus all of its descendants.

Could be within Avialae (Ground Up hypothesis), or it could include
Coelurosauria (BCF).

--T. Michael Keesey
tkeese1@gl.umbc.edu | THE DINOSAURICON: http://dinosaur.umbc.edu/
AOL IM:  Ric Blayze | WORLDS:    http://www.gl.umbc.edu/~tkeese1/