A strange horned dinosaur from the Cretaceous period was discovered in Utah that is believed to have evolved in North America.

According to the Proceedings of the Royal Society B,a leading scientific journal for biology, the Nasutoceratops titusi (N. titusi) belongs to the Triceratops family. The discovery strengthened the evidence that dinosaurs in west United States are clustered in two distinct dinosaur communities.

The newly discovered dinosaur's latin name, which means Large-Nosed Horned Face, was derived from its features. N. titusi had two enormous horns on its head estimated to be 2.5 feet that is curved forward.

It belongs to the first group of short-frilled horned dinosaurs that scientists found in 2006 in American south when they began to find the fossils, correcting previous theories that those group only lived in the north.

The scientists believed that the huge horns of N. titusi are used for mating purposes and not to beat up other predators.

"The horns were to compete for mates to attract members of the opposite sex, and to intimidate or possibly fight members of the same sex," Scott Sampson, paleontologist at the Denver Museum of Nature & Sciences, said.

Meanwhile in Florida, a tooth of the Tyrannosaurus rex was found in a tail of a plant-eating dinosaur. The tooth was discovered by Robert DePalma's team of the Palm Beach Museum of Natural History in Fort Lauderdale.

The discovery team believed that the dinosaur who escaped from the T. rex could be a live hadrosaur, a duck-billed dinosaur. The dagger-like tooth is about 1.5 inches in length and 1 inch wide.

"We now have conclusive evidence that T. rex indeed engaged in predatory behavior," the team said in the Proceedings of the National Academy of Sciences journal.