It is possible that predatory dinosaurs stored fat when prey was especially abundant-perhaps up to 15 percent or so of their iean mass. Animatronic dinosaur costume Much more than this, however, is unlikely because of the need to stay light in weight and fleet of foot. Indeed, theropods probably looked lean, sleek, and a little bony, like big dogs and cats. “Plump” theropod drawings are certainly wrong.t3 What fat they had may have been concentrated around the base of the tail. The fatless tails I usually draw can be taken to show the animals in the lean season.
What can we tell about what was inside predatory dinosaur rib cages? Walking dinosaur costume In most animals the lungs are large dead-end bags which are ventilated by motions of the long front ribs. Dinosaur belly ribs are much shorter.The paleodinosaurs and basal theropods were like this; in fact, the first trunk rib was a little longer than the next. Birds are very different, having much smaller, stiffer lungs set high up in the rib cage.ra The frontmost trunk ribs are short and no longer do much to ventilate the lungs. Instead, the lungs are connected to air sacs that line the sides of the abdomen. The belly ribs are long and inflate and deflate these air sacs. The air sacs in turn act as bellows to ventilate the lungs. Realistic dinosaur costume The system is set up so that air flows through the lungs in one direction only, and it is always fresh. “Dead,” oxygen-depleted air is not pushed back and forth with each breath; instead, it is completely exhaled each time. A look at complete avetheropod rib cages shows they were avian in design. The front ribs were short, too short to have ventilated large normal lungs. The belly ribs were long, and this can be explained only if they were ventilating large abdominal air sacs that in turn fed unidirectionalair flow lungs.