Specimen:  RMDRC "Pebbles" (cast)

Discovery:  Mike Triebold, 1999

Excavated:  Teton County, MT

Length:  20 ft

Height:  8 ft

Weight:  est. 2 tons

Albertosaurus was a theropod a member of the family Tyrannosauridae. The fossilized skeleton, field name “Pebbles” after the pebbly matrix in which it was found, was more than 55% complete with all areas of the skeleton being represented. The original specimen now resides at the Museum of Ancient Treasures in Wichita, KS.

Compared  to T. rex, Albertosaurus was more slender and lightly built. Its skull was shorter and flatter with around 58 thinner, sharper teeth. Some estimates of maximum size are 30 to 33 ft long and 10 to 11 ft tall. Due to its proportions, this bipedal dinosaur with tridactyl feet is estimated to have a top running speed of 18 to 24 mph for juveniles, growing slower the larger they grew.