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Since Microraptor and other dromaeosaurids possessed feathers, it is reasonable to assume that this trait was present in all of Dromaeosauridae.

Feathers were very unlikely to have evolved more than once, so assuming that any given dromaeosaurid, such as Utahraptor, lacked feathers would require positive evidence that they did not have them.

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One claw specimen is preserved at 22 centimetres (8.7 in) in length and is thought to reach 24 cm (9.4 in) restored. ostrommaysorum specimens are estimated to have reached up to 7 metres (23 ft) long and somewhat less than 500 kilograms (1,100 lb) in weight, comparable to a polar bear in size.

Examination of the fossils are ongoing after a decade of excavation, but if Kirkland is correct, it may be one of the best preserved predator traps ever discovered.

Moa extinction occurred around 1300 Although moa skeletons were traditionally reconstructed in an upright position to create impressive height, analysis of their vertebral articulation indicates that they probably carried their heads forward, in the manner of a kiwi.

The spine was attached to the rear of the head rather than the base, indicating the horizontal alignment.

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 June 1993 for the American paleontologist John Ostrom from Yale University's Peabody Museum of Natural History, and Chris Mays of Dinamation International.

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