Sinosauropteryx
"Sinosauropteryx" was a small bipedal theropod, noted for its short arms, large first finger (thumbs), and long tail. The taxon includes some of the smallest known adult non-avian theropod specimens, with the holotype specimen measuring only in length, including the tail. However, this individual was relatively young. The longest known specimen reaches up to in length, with an estimated weight of .
Tyrannosauridae
The tyrannosaurids were all large animals, with all species capable of weighing at least 1 metric ton. A single specimen of "Alioramus" of an individual estimated at between long has been discovered, although it is considered by some experts to be a juvenile. "Albertosaurus", "Gorgosaurus" and "Daspletosaurus" all measured between long, while "Tarbosaurus" reached lengths of from snout to tail. The massive "Tyrannosaurus" reached in the largest specimen, FMNH PR2081.