What is Albertosaurus?
{{italictitle}} {{Taxobox | name = ''Albertosaurus'' | fossil_range = [[Upper Cretaceous]] | image = Konglong1.jpg | image_caption = ''Albertosaurus sarcophagus'' | image_width = 230px | regnum = [[Animal]]ia | phylum = [[Chordata]] | classis = [[Sauropsid]]a | superordo = [[Dinosauria]] | ordo = [[Saurischia]] | subordo = [[Theropoda]] | familia = [[Tyrannosauridae]] | genus = '''''Albertosaurus''''' | genus_authority = [[Henry Fairfield Osborn|Osborn]], 1905 | subdivision_ranks = [[Species]] | subdivision = *''[[Albertosaurus sarcophagus|A. sarcophagus]]'' <small>Osborn, 1905</small> }} '''''Albertosaurus''''' was a relative of ''[[Tyrannosaurus]]''. It was smaller than ''T. rex'' and lived a few million years earlier. ''Albertosaurus'' walked on two legs and had a large head with sharp, saw-toothed [[teeth]]. It had two-fingered hands on short [[arm]]s. Its long tail provided balance and quick turning. It had powerful back legs with clawed, three-toed feet. ''Albertosaurus'' was about 30 feet (9 m) long, about 11 feet (3.4 m) tall at the hips, and up to 3 tons in weight (averaging roughly 2500 kg). Its lower [[jaw]] had 14 to 16 teeth; the upper jaw had 17-19 teeth. It had one row of teeth in each jaw and had at least one replacement tooth growing up under each working tooth. ''Albertosaurus'' was more lightly built than ''[[Tyrannosaurus]]''. Most ''Albertosaurus'' specimens were found in a single place.<ref>{{cite journal | last1 = Erickson | first1 = Gregory M. | last2 = Currie | first2 = Philip J. | last3 = Inouye | first3 = Brian D. | last4 = Winn | first4 = Alice A. | year = 2010 | title = A revised life table and survivorship curve for ''Albertosaurus sarcophagus'' based on the Dry Island mass death assemblage | url = https://archive.org/details/sim_canadian-journal-of-earth-sciences_2010-09_47_9/page/1269 | journal = Canadian Journal of Earth Sciences | volume = 47 | issue = 9| pages = 1269–1275 | doi = 10.1139/e10-051 | bibcode = 2010CaJES..47.1269E }}</ref> Compared with the robust tyrannosaurin