Can avian endogenous retroviruses change a bird to a dinosaur?

Avian endogenous retroviruses might be fossils of viruses that infected to dinosaurs. Some mammalian endogenous retroviruses are known to contribute to the formation of reproductive organs of host animal. Therefore we cannot deny a possibility that functional endogenous retroviruses may have evolved dinosaurs to present birds. What should we do for demonstrating this theory? We first should find the factor that can obviously distinguish birds from dinosaurs, because we cannot judge whether a factor actually contribute to the evolution of birds from dinosaurs if we don’t know what is dinosaurs. When we artificially reduce a factor in avian cells, some changes, for example decrease/increase of many genes will happen. Can we identify which phenomenon actually contributes to the evolution from dinosaurs? Thus, the most important thing to do is to know what dinosaurs are. After determining the dinosaur factors, we can examine the effect of these factors to the evolution of birds after artificial reduction of avian endogenous retroviruses. This will be the second step. Someday we may change a bird to a dinosaur by controlling its endogenous retroviral factors.