| Diet | Carnivore |
| Height | 4m |
| Length | 11.5m |
| Weight | 6.2 tonnes |
| Speed | 32 km/h |
| Environment | Land |
| Era | Cretaceous |
| Period | Early Cretaceous |
| Type | Theropod |
| Location | North America |
Acrocanthosaurus was a massive theropod dinosaur that dominated the landscapes of North America during the Early Cretaceous period, between 125 and 99.6 million years ago. This fearsome predator was one of the largest land carnivores of its time, measuring up to 11.5 metres in length and standing 4 metres tall at the hip. Its fossils have been discovered across a remarkably wide range, from Oklahoma and Texas in the west to Maryland in the east, suggesting it was one of the most successful large predators of its era.
The most distinctive feature of Acrocanthosaurus was the prominent ridge of tall neural spines running along its back, which likely supported a muscular hump or sail-like structure. These spines could reach up to 17 times the height of the vertebrae themselves. The dinosaur possessed a large skull measuring over a metre in length, filled with sharp, serrated teeth perfectly designed for slicing through flesh. Its powerful arms were proportionally longer than those of later giant theropods, ending in three-fingered hands with large claws.
As an apex predator, Acrocanthosaurus would have hunted the large herbivorous dinosaurs that shared its environment, including sauropods and ornithopods. Its robust build and powerful legs suggest it was built more for strength and endurance rather than speed, though it could likely reach speeds of up to 32 km/h when pursuing prey. The muscular hump on its back may have served multiple purposes, including fat storage, temperature regulation, and visual display.
Acrocanthosaurus represents an important chapter in theropod evolution, showing how these predators adapted to fill the role of apex carnivore across vast continental areas. Its wide distribution suggests it was highly successful in exploiting diverse ecosystems throughout Early Cretaceous North America.
Acrocanthosaurus is immediately recognisable by the prominent ridge of tall neural spines running along its back, creating a distinctive hump or low sail. It also possessed a large, robust skull over a metre long and proportionally longer, more powerful arms than later giant theropods.
Acrocanthosaurus was likely an ambush predator that used its powerful build to overpower large prey rather than relying on speed. The prominent back ridge may have been used for species recognition and territorial displays, whilst also serving as energy storage for lean periods.
Acrocanthosaurus has appeared in several dinosaur documentaries and video games, often portrayed as a formidable predator of Early Cretaceous North America. It features in the Walking with Dinosaurs series and various dinosaur simulation games.
| Phylum | Chordata |
| Class | Saurischia |
| Order | Avetheropoda |
| Family | Carcharodontosauridae |
| Genus | Acrocanthosaurus |
Acrocanthosaurus was first described by J. Willis Stovall in 1950. The original fossils were discovered at Antlers Formation, Oklahoma, USA.
