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crocodylomorphs?/ birds

1) what is a crocodylomorph?
2) so the current theories re birds are 1) they and the dromaeosaurs came 
from the same stock, and branched apart during the early jurassic
 2) dinosaurs are an offshoot from reptiles to birds
4) are archaeopteryx and protoavis properly considered birds (if only 
barely), or are they their own group?
Blaise "Enough with Godzilla, the kid's only 4 after all" Considine