This is the other way around. There are some who want to push back the definition of “bird” to include more dinosaurs via earlier divergence. There are even a few that argue that certain conventially non-avian dinosaurs are actually from the agreed bird lineage but converged back on a bipedal dinosaur shape.
This is the other way around. There are some who want to push back the definition of “bird” to include more dinosaurs via earlier divergence. There are even a few that argue that certain conventially non-avian dinosaurs are actually from the agreed bird lineage but converged back on a bipedal dinosaur shape.