T. Michael Keesey wrote- > Incidentally, if you are using the crown clade definition of _Aves_ > (=_Neornithes_), then _Liaoxiornis_ would be a pretty tiny non-avian dinosaur. Because it's juvenile. :-) http://www.cmnh.org/dinoarch/2001Jul/msg00344.html The smallest adult non-neornithine dinosaur may be Iberomesornis, at ~85 mm long. Mickey Mortimer