Appalachiosaurus Facts
| Diet | Carnivore |
| Height | 2.2m |
| Length | 6.5m |
| Weight | 623 kg |
| Environment | Land |
| Era | Cretaceous |
| Period | Late Cretaceous |
| Type | Theropod |
| Location | North America |

| Diet | Carnivore |
| Height | 2.2m |
| Length | 6.5m |
| Weight | 623 kg |
| Environment | Land |
| Era | Cretaceous |
| Period | Late Cretaceous |
| Type | Theropod |
| Location | North America |
Appalachiosaurus was a fearsome theropod dinosaur that prowled the ancient landscapes of eastern North America during the Late Cretaceous period, between 85.7 and 72.2 million years ago. Named after the Appalachian Mountains where its fossils were discovered, this predator was closely related to the famous Tyrannosaurus rex, though it lived several million years earlier.
As a basal member of the tyrannosaur family tree, Appalachiosaurus shared many characteristics with its more famous relatives whilst retaining some primitive features. It was a powerful bipedal hunter with strong hind limbs built for pursuing prey across the Cretaceous floodplains and forests of what is now Alabama. Like other theropods, it possessed sharp, serrated teeth perfect for slicing through flesh and bone.
The only known specimen represents a juvenile individual measuring approximately 6.5 metres in length and weighing around 623 kilograms. This suggests that fully grown adults would have been considerably larger and more formidable predators. The discovery of Appalachiosaurus has provided valuable insights into tyrannosaur evolution and distribution, showing that these apex predators were spread across much of Late Cretaceous North America.
Living in the warm, humid climate of the Late Cretaceous southeastern United States, Appalachiosaurus would have shared its environment with various other dinosaurs, including hadrosaurs and other herbivorous species that likely formed the bulk of its diet.
Appalachiosaurus possessed the characteristic large head and powerful jaws of tyrannosaurs, though it retained some more primitive features compared to later species like T. rex. Its robust build and strong leg bones indicate it was well-adapted for hunting in the dense forests of Late Cretaceous eastern North America.
As an apex predator, Appalachiosaurus likely hunted both alone and possibly in small groups, using its powerful bite and sharp claws to take down prey. The discovery of only juvenile remains suggests that young individuals may have occupied different ecological niches than adults, possibly hunting smaller prey until they reached full size.
| Phylum | Chordata |
| Class | Saurischia |
| Order | Avetheropoda |
| Genus | Appalachiosaurus |
Appalachiosaurus was first described by Thomas Carr in 2005. The original fossils were discovered at Demopolis Chalk Formation, Alabama, USA.