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Alectorsaurus is another Asian ancestor of Tyrannosaurus.
Alectrosaurus was only about half the size of T. rex and it was more lightly built - closer to Albertosaurus. It was about 20 feet long and had a mouth full of large, razor-sharp teeth that would have made this a pretty ferocious animal.
Alectrosaurus was discovered in 1923 during one of the American Museum of Natural History expeditions to China led by Roy Chapman Andrews. It was described in 1933 and re-described in 1989. It is considered to be a typical tyrannosaur family member and may in fact be a direct ancestor of Tyrannosaurus bataar.
Not much of this dinosaur has been found, and some of the fossils that were originally thought to belong to Alectrosaurus were later determined to belong to another dinosaur.