The fun way to learn: there's more information about the giants of the dinosaur world in the accompanying booklet!  With moveable lower jaw!  The Acrocanthosaurus was around the same size and weight as the Tyrannosaurus Rex and Giganotosaurus.  The Acrocanthosaurus was around the same size and weight as the Tyrannosaurus Rex and Giganotosaurus. Unlike many other dinosaurs it had seven openings in its skull rather than five. It also had lots of neural spines on its neck back and tail which probably formed a small sail.  The openings in the Acrocanthosaurus's huge skull reduced its weight."
 
Dimensions 8.819X4.724X5.472 Inch (W X D X H)