Acrocanthosaurus (Acrocanthosaurus atokensis) was one of the largest predators of Early Cretaceous North America. Its name means “high-spined lizard,” referring to the tall neural spines along its back that gave it a dramatic silhouette.
Time Period
Acrocanthosaurus lived during the Cretaceous Period (often placed in the Early Cretaceous). In your site filter, this is grouped under Cretaceous.
Habitat
Fossils are best known from the Antlers Formation of the southern United States. This region is commonly reconstructed as river systems, floodplains, and forests that supported large herbivores—and the predators that hunted them.
Size and Appearance
Acrocanthosaurus reached about 11–12.5 meters in length. The tall spines along its back likely supported a ridge of muscle and tissue, or possibly a low sail-like structure. Like other giant theropods, it had a large skull with sharp teeth, strong hind legs, and a long tail for balance.
Diet and Hunting
As a carnivore, Acrocanthosaurus hunted other animals. Its teeth and skull were well suited for slicing flesh rather than crushing bone. It likely attacked large prey with repeated bites and powerful head-and-neck movements, potentially targeting juveniles, injured individuals, or smaller animals when available.
Why Acrocanthosaurus Matters
Acrocanthosaurus shows that gigantic apex predators existed in North America before tyrannosaurs became dominant. It also helps scientists understand the spread of carcharodontosaur-like predators across the world during the Cretaceous.
