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It was named in 2009 by Clifford A
Known locations: South America
Struthiomimus had a build and skeletal structure typical of ornithomimids
It is likely that mosasaurs became extinct along with the dinosaurs during the extinction event at the end of the Cretaceous Period
or duck-bills
Utahraptor ostrommaysorum, Skull Pteranodon It was named in 2009Utahraptor (meaning "Utah's predator" is a genus of theropod dinosaurs. It contains a single species, Utahraptor ostrommaysorum, which is the largest known member of the family Dromaeosauridae. Fossil specimens date to the upper Barremian stage of the early Cretaceous period (in rock strata dated to 126 2. 5 million years ago). The holotype specimen of Utahraptor is fragmentary, consisting of skull fragments, a tibia, claws and some caudal (tail)