Sinosauropteryx
"Sinosauropteryx" was a small theropod with an unusually long tail and short arms. The longest known specimen reaches up to in length, with an estimated weight of It was a close relative of the similar but older genus "Compsognathus", both genera belonging to the family Compsognathidae. Only one species of "Sinosauropteryx" has been named: "S. prima", meaning "first" in reference to its status as the first feathered non-avialian dinosaur species discovered. Three specimens have been described. The third specimen previously assigned to this genus represents either a second, as-yet unnamed species or a distinct, related genus.
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.