The Creationist fairy tale proposes that “Dinosaurs died after the Biblical Flood because their lungs were too small.” Left unexplained is the assumption that dinos used most of their lungs and mammals used less of their lungs so they had excess capacity to spare. Or why reptiles used less of their lungs than dinosaurs. Those assumptions are made—with no explanation as to mechanism—to give the fairy tale the desired ending.
Credit: Zina Deretsky, National Science Foundation
In contrast, science has a detailed and clear explanation of how birds’ respiration is more efficient than ours and how closely it resembles that of dinosaurs.
For the basics, see avian respiration.
For the research, see “Study Documents Bird-like Breathing Systems in Long-extinct Dinosaurs”.
See also wacky Creationist news.