Word: rex
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Andrea Dorfman remembers viewing Tyrannosaurus rex in New York City's American Museum of Natural History as a grade schooler, and, like millions of her peers, being "mesmerized. How could you not be captivated by those huge teeth?" she asks...
...interrupts a leisurely meal of ferns and twigs to glance around uneasily. Though the 11-ton creature is an intellectual lightweight, it senses the danger lurking in the surrounding forest. Suddenly, out from behind a tree lumbers one of the largest and fiercest carnivores that have ever lived: Tyrannosaurus rex. Although this beast is a mere adolescent, it is 15 ft. tall and armed with dagger-sharp teeth. The triceratops attempts a retreat, but the cold-blooded creature can only move slowly. It is too soon after sunrise, and the dinosaur hasn't had time to absorb the heat...
...million years ago is now passe. Many experts believe that one resilient line is still flourishing today. The common name for these modern dinosaurs: birds. Observes Mark Norell, a paleontologist at the American Museum of Natural History in New York City: "Birds are more closely related to Tyrannosaurus rex than Tyrannosaurus is to almost any dinosaur you've ever heard...
...them varies in size according to the number of nerve fibers it contains, and that in turn depends on how much the muscles controlled by these nerves are used. Giffin is trying to determine whether theropods -- the dinosaurian suborder that includes fierce predators like Oviraptor, Deinonychus, Velociraptor and Tyrannosaurus rex -- could have used their undersize forelimbs for grasping or whether the arms were purely vestigial...
...such thing as 'the dinosaur.' There were seven groups living 150 million years ago that started out as one thing and perhaps evolved into something else." Although Deinonychus, Velociraptor and other small, meat-eating bipeds may have been warm-blooded, Brett-Surman believes large predators like Tyrannosaurus rex, which went through three vastly different growth stages, may have been equipped with a variable metabolism...