Although the idea that birds evolved from dinosaurs is a popular concept among evolutionists, this is at least in part because the theory of evolution requires an ancestor for every taxon, and the evolutionist needs an ancester for birds. Dinosaurs provide an available pool from which to devise such an ancestor. However, if one wished to do so, and if one accepted Chatterjee's Triassic remains as avian (bird), then one could with some effort construct a case for deriving the dinosaurs from the birds! The current status of birds and dinosaurs is in flux with respect to the physical evidence. An excellent review of the present status by Ashby Camp can be found at this site.
2010 Arthur V. Chadwick, Ph.D.