Wait a minute! You just said dinosaurs were birds!
Anyways, were are the intermediates? where is the fossil record? There is NO fossil record to prove this, nor can you explain why dinosaurs didn't have gizzards and a had a completely different digestive system. Where are the birds with razor sharp teeth? What dinosaur was an owl? What dinsaur was a penguin? Why is the DNA completely different? Birds were NOT dinosaurs, they were little birds exactly like they are now.
We look at ancient dinosaurs and observe that some of them had large fibrous structures on their faces that look like whistles, but could readily be beaks if you tweeked the genes just so.
All same thing GI and you can't make them different~!
Still, with modern gene splicing we will be able to have flying penguins and swimming owls in due course ~ it's just a matter of swapping parts.