Albertosaurus

From Wikipedia

This is the group name for a number of species, including:

Albertosaurus libratus (Lambe, 1914)

Skull lenght : up to 1 m.
Total length : 8.6 m.
Hip height : 2.8 m
Weight : 2.5 tonnes

Albertosaurus arctunguis (Parks, 1928)

Skull length : up to 1 m.
Total length : 8 m.
Hip height : 2.5 m.
Weight : 2 tonnes

Albertosaurus looked a lot like Tyrannosaurus, but they were smaller. Like Tyrannosaurus, they had small arms and a huge head with recurved serrated teeth. These teeth however, are more strongly curved than those of Tyrannosaurus. Unlike Tyrannosaurus, who evolved a lot, all the found specimens of Albertosaurus suggest that they didn't evolve much in over 10 million years, except for becoming a bit more gracile.

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