"Alberta lizard" (Gr. 'sauros' - lizard, reptile)
, a few others as well
; 75 mya
Location: North America
, by Osborn
28 ft. (8.5 m)
10 ft. (3 m) at the hip
2.5 tons (2,300 kilos)
a few complete skeletons, some partial too.
Albertosaurus is considered the best-known of all tyrannosaurids. It was massively built, with large head and jaws, and tiny two-fingered hands, typical features of the latest generation of theropods. It is a close ancestor of Tyrannosaurus, looking like a slightly smaller and less muscular version of its grandson, the famous T-rex.
Scientists know a lot about this animal becuase they have found so many specemins, many in the same place, giving rise to the theory that Albertosaurus was a pack animal and not a solitary hunter/scavenger like Tyrannosaurus.