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Creature information
Scientific name : Utahraptor ostrommaysorum
Time period : Early Cretaceous
Primary diet : Carnivore
In the series
Appearances : Survival Tactics
Utahraptor ("Utah Thief") was a carnivorous theropod dinosaur and probably a swift moving animal that lived in the Early Cretaceous (126 million years ago) and was the largest Dromeaosaur of the maniraptoran dinosaur group and weighed about half a tonne with a big killing claw, it also had feathers like birds do. It might have lived in packs and could have been twice deadly as a modern big cat Like a lion or tiger. In other words they were fast, deadly and very dangerous creatures.

Physical Characteristic Edit


The largest described U. ostrommaysorum specimens are estimated to have reached up to 7 m (23 ft) long and somewhat less than 500 kg (1,100 lb) in weight, comparable to a polar bear in size.

It is thought that Utahraptor may be closely related to the smaller Dromaeosaurus and the giant Mongolian dromaeosaurid genus Achillobator.



Discovery Edit

The first specimens of Utahraptor were found in 1975 by Jim Jensen in the Dalton Wells Quarry in east-central Utah, near the town of Moab, but did not receive much attention. After a find of a large foot-claw by Carl Limoni in October 1991 James Kirkland, Robert Gaston, and Donald Burge uncovered further remains of Utahraptor in 1991 in the Gaston Quarry in Grand County, Utah, within the Yellow Cat and Poison Strip members of the Cedar Mountain Formation.[1] Radiometric dating has shown that these parts of the Cedar Mountain Formation were deposited about 124 million years ago.[9] The type specimen, CEU 184v.86, is currently housed at the College of Eastern Utah Prehistoric Museum, although Brigham Young University, the depository of Jensen's finds, currently houses the largest collection of Utahraptor fossils.

The type species (and only known species of Utahraptor), Utahraptor ostrommaysorum, was named by Kirkland, Gaston, and Burge in 1993 for the American paleontologist John Ostrom from Yale University's Peabody Museum of Natural History, and Chris Mays of Dinamation International. Originally, in the specific name, the singular genitive ostrommaysiwas used but, in 2000, this was emended by George Olshevsky to the plural. Earlier, it had been intended to name the species "Utahraptor spielbergi", after film director Steven Spielberg, in exchange for funding palaeontological research, but no agreement could be reached on the amount of financial assistance.

Survival TacticsEdit

It appeared in the third episode where 2 packs (brown and grey) were after the same young Cedarosaurus in a herd. The grey pack got to it first but the brown ones fought with them. They wounded each other until 2 members of each pack were left. The young tried to escape while they were fighting but a crocodilyform grabbed it's back leg and the Utahraptors saw this and raced into action and forced the croc away (one stabbed its eye with the killing claw). As they were about to kill the young sauropod, the adults arrived and one kicked a brown one and killed it and one knocked a grey one into the lake. The young was now with the herd and only one of each member of the pack survived as they retreated. At the end the grey one was swimming up to the surface but the crocodilyform from before grabbed it and killed it.   


A small gang of Utahraptors.

Trivia Edit

Originally one of the scientific names were Utahraptor spielbergi, but it was not selected.

Some unpublished material might mean a new look for Utahraptor.

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