Size and Weight:
During the late Triassic period, the ancient reptiles known as archosaurs began to split off into two main groups: the dinosaurs and the crocodiles. Doswellia seems to have been an intermediate form: it had the low, slender, ground-hugging shape of a crocodile, but the armor plating on its back was reminiscent of much later ankylosaur dinosaurs. Further complicating matters, paleontologists can't tell whether Doswellia was a vegetarian or a meat eater: its lower jaw implies a carnivorous lifestyle, but its ponderous gait would have made it fairly unthreatening to prey animals. Unfortunately, the teeth are missing from the only known fossil, so (pending further discoveries) we may never know for sure.