Dinosaurs Alive 3D 2007. The documentary follows paleontologists uncovering dinosaur fossils across the globe. Scientists examine specimens from the Triassic period 230 million years ago. Early dinosaurs were modest in size, no larger than modern cats or dogs. The film traces their evolution into Cretaceous giants. Researchers argue descendants of dinosaurs live among us. Birds carry ancient features visible in modern species. IMAX cameras capture life-sized recreations of prehistoric creatures. The documentary presents excavations in Mongolia and New Mexico. Computer animation brings extinct species to life. The production connects past discoveries to contemporary science.