Gigantoraptor, despite its name, wasn't actually a raptor; it was an oviraptorosaur, a group of feathered dinosaurs more closely related to birds.
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Herrerasaurus, one of the earliest known dinosaurs, lived during the Late Triassic period, predating many of the more well-known dinosaur groups.
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Irritator's skull was deliberately altered by fossil hunters who tried to make it more marketable, filing down parts of it before it was studied scientifically.
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Oviraptor's name, meaning "egg thief," is a misnomer. The first fossil was found near a nest of what were assumed to be Protoceratops eggs, but later discoveries showed it was actually sitting on its own eggs.
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