Aurocarnotaurus

Aurocarnotaurus was a species of Abelisaurid that lived in what is now South Dakota and Montana, as well as in Alberta, Canada. It was the only Abelisaurid to make it into North America. It lived during the Late Cretaceous, from 80 million years ago to 66 million years ago. It was most likely very Carnotaurus-like, hence their name as their fossils showed. Since it had thick leg bones, this suggests that it was a strong runner and was able to hunt Pachyrhinosaurus and Hadrosaurs in high speeds up to about 35 miles per hour. It was the largest ever Abelisaurids and among the biggest theropods, growing about 50 feet long. It was the top predator of its landscape before the arrival of Tyrannosaurus Rex from Asia, preyed mainly on horned dinosaurs including Pachyrhinosaurus, Hadrosaurs like Maiasauras, and among others, but due to the invasion of non-native (and possibly invasive) Tyrannosaurus Rex, the Aurocarnotaurus had to adapt to deal with the non-native Tyrannosaurus Rex so it became mainly scavenging creatures that stole kills from Tyrannosaurus Rex. Both theropods, however, couldn't survive the mass extinction brought on by an asteroid impact and its effects.