 Acrocanthosaurus was a bipedal predator . As the name suggests , it is best known for the high neural spines on many of its vertebrae , which most likely supported a ridge of muscle over the animal 's neck , back and hips . Acrocanthosaurus was one of the largest theropods , approaching 11 @.@ 5 m ( 38 ft ) in length , and weighing up to 6 @.@ 2 tonnes ( 6 @.@ 8 short tons ) . Large theropod footprints discovered in Texas may have been made by Acrocanthosaurus , although there is no direct association with skeletal remains . 
