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RE: another dumb question: Terror Birds are not dinosaurs?

You can see Paul Sereno's graphic, "Major stages in the evolution of modern
avian skeletal design and function," at
http://cas.bellarmine.edu/tietjen/Evolution/Dinos/figure_4.htm .  

Dino Guy Ralph
Docent at the California Academy of Sciences
Dinosaur and Fossil Education
Member of the Society of Vertebrate Paleontology