All in all, predatory dinosaurs fit the birdlike physiological model very well. Walking dinosaur costume Endothermic homeothermy is fully in line with their body and limb design, bone histology and the fast gror.’,th it implies, parental care, fast walking speeds, predator/prey ratios, and polar populations. It even e>rplains the great size of the “bulkinsulating” species on the one hand, and the dinosaur’s initial size squeeze on the other. Animatronic dinosaur It is a very straightforward sifuation, and an obvious one since dinosaurs cre built like mammals and birds. One possible difference is that dinosaurs may have had less nonshivering thermogenesis-producing brown fat than do birds and mammals, or none at all. As explained above, this may have led to the occasional formation of growth rings. Only the small brains of big theropods are not explained by high metabolic rates, but the reptilian metabolics do not solve that issue either.
In contrast, the idea that theropods were either bulk homeotherms or bulk endotherms is fraught with flaws and implausibilities. Both concepts are hypothetical, and the latter is at odds with what we know about living reptile physiology. Realistic dinosaur costume Indeed, bulk endothermy is virtually disproved by the big brains of small theropods. By taking a negative stance, one can take each argument for theropodian endothermy of the avian-mammalian style in isolation and find problems with it. One can get dinosaurs to fit, with difficulty, into a few points of the reptilian models. Big lowmetabolic- rate theropods would have fairly constant body temperatures under normal conditions, and their fast growth does not demand the very highest metabolisms. But when one ties to fit the entirety of what is known about theropodian anatomy and ecology into the reptilian box, it takes inordinate pushing and shoving. Even then many things, such as their birdlike limbs and the existence of polar theropods, still hang out.