![]() However, most evidence points to them simply being juveniles of Tyrannosaurus, rendering Nanotyrannus a dubious genus. A 75-million-year-old fossil of a juvenile tyrannosaur helps explain why the apex predators ruled the food chain, new research shows. Juvenile Tyrannosaurus look so radically from adults that some researchers classify them as adults of an entirely new genus called "Nanotyrannus".By the time they become subadults, they begin to develop the more iconic traits seen in mature rexes, becoming slow-moving ambush predators and developing shorter, broader skulls with bone-crushing, spike-like teeth. Juveniles bear very little resemblance to adults, and were fast-moving pursuit predators with lean builds and long, narrow skulls with bladelike teeth. Tyrannosaurus went through a distinctive ontogenetic niche shift as they grew from hatchling to adult.Tyrannosaurus likely lacked feathers, but its less derived relatives, the proceratosaurus, retained them. It and other tyrannosauroids are actually members of the theropod clade Coelurosauria, which mainly consisted of lightly built feathered animals such as dromaeosaurids, troodontids, ornithomimids, and even modern birds. Despite their loose resemblance to animals such as Allosaurus and Carnotaurus, Tyrannosaurus was not closely related to either of them.The most notable Tyrannosauruses are the Tyrannosaurus family, Annie, Boris, Dolores and Buddy. Tyrannosaurus lived during the Cretaceous in Western North America. (more) The longest known tyrannosaur skull is 1.3 metres (more than 4 feet) long. ![]() rex hatchling underscores the dinosaur's dramatic growth, as it ballooned from a turkey-size juvenile to a gargantuan adult. The huge mouth of Tyrannosaurus rex contained some 60 teeth that could protrude as far as 15 cm (6 inches). Some scientists think that Tyrannosaurus could eat more than 200 pounds of meat in one bite. The exhibit's minuscule and endearingly fluffy model of a T. It ate large dinosaurs, like Triceratops. Tyrannosaurus rex was a large meat-eater from the Cretaceous. ![]()
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