Birds, and reptillians, are the progeny supposedly. The dinosaurs were reptilian with air temperature bodies, slow metabolisms, and temperature regulated growth cycles. The avian with rapid heartbeats, high internal body temperatures, high metabolism, and therefore much higher caloric intake... Wait...what?
“The dinosaurs were reptilian with air temperature bodies, slow metabolisms...”
Actually the scientific consensus and evidence seem to show that many dinosaurs were fast and warm blooded as were the birds that evolved from them.
Not to mention a totally different respiratory system.
You state: “Birds, and reptillians, are the progeny supposedly.” In fact the dinosaurs were an offshoot of the reptilian line. Both continued to evolve and differentiate over time. For that matter, mammals separated and evolved at almost the same time as dinosours or perhaps a little earlier, although the great Permian extinction greatly weakened the mammalian line and allowed the dinosaurs to erupt on the world stage. The point is that by the time dinosaurs existed that were most likely warm blooded, many millions of years separated them from their cold blooded reptilian antecedents.