Siats Facts
| Diet | Carnivore |
| Height | 3.5m |
| Length | 9m |
| Weight | 4 tonnes |
| Environment | Land |
| Era | Cretaceous |
| Period | Late Cretaceous |
| Type | Theropod |
| Location | United States |

| Diet | Carnivore |
| Height | 3.5m |
| Length | 9m |
| Weight | 4 tonnes |
| Environment | Land |
| Era | Cretaceous |
| Period | Late Cretaceous |
| Type | Theropod |
| Location | United States |
Siats was a massive theropod dinosaur that dominated the prehistoric landscapes of North America during the Late Cretaceous period, approximately 100.5 million years ago. This fearsome predator lived in what is now Utah, United States, during a time when the continent was much warmer and more humid than today. Siats represents one of the largest predatory dinosaurs known from this particular time period in North America.
Standing roughly 3.5 metres tall at the hip and measuring about 9 metres in length, Siats was a formidable hunter that likely weighed around 4 tonnes. As a theropod, it walked on two powerful legs and possessed sharp, curved claws and teeth perfectly adapted for catching and dismembering prey. Its classification has sparked considerable debate amongst palaeontologists, with some researchers placing it within the Megaraptoridae family, whilst others suggest it may belong to different theropod groups.
Siats was likely an apex predator in its ecosystem, using its impressive size and strength to hunt large herbivorous dinosaurs. Its powerful jaws were filled with razor-sharp teeth designed for slicing through flesh and bone. The discovery of Siats has provided valuable insights into the diversity of large predatory dinosaurs that existed before the rise of the famous tyrannosaurs, helping scientists understand how these prehistoric ecosystems functioned.
Siats possessed the typical theropod body plan with powerful hind limbs, sharp claws, and a large skull filled with pointed teeth. Its exact distinguishing features remain somewhat unclear due to incomplete fossil material, but its impressive size made it one of the largest predators of its time period.
As a large apex predator, Siats likely hunted alone or possibly in small groups, targeting large herbivorous dinosaurs in its territory. It probably used its powerful legs to chase down prey and its massive jaws and claws to deliver fatal attacks.
Siats was first described by Lindsay Zanno and Peter Makovicky in 2013. The original fossils were discovered at Cedar Mountain Formation, Utah, USA.