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Life on Lan3 - forelimbs This latter feature may have been...

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Life on Land A smaller carnovore that preceeds T. rex in time is Albertosaurus . This smaller version of T. rex reached lengths of between 7 and 8.5 meters and weighed in at a mere 2 tons. It ranged North America in the time interval just prior to the rise of T. rex . A related group of carnivorous Cretaceous dinosaurs is the dromaesaurs, considered by some recent studies to be the sister group to the birds. Dromaesaurs had been around since the Jurassic or earlier. Sometime during the Jurassic the line leading to birds diverged. The dromaesaurs had a variety of unique features, such as their slashing modified foot claw, as well as an inferred behavior of grasping with their
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Unformatted text preview: forelimbs. This latter feature may have been important in the evolution of avian dinosaur flight. Until the Cretaceous, dromaesaurs were smallish predatory dinosaurs. Deinonychus , considered one of the most important dinosaurs ever found, was a small animal about 3-4 meters long, weighing a mere 75 kg. Utahraptor , discovered from middle Cretaceous rocks in Utah, is the largest dromaesaurid at a weight of one ton and a length of 5 to 7 meters. Velociraptor , the dromaesaurid so prominent in the Jurassic Park series, was about 2 meters long and had an estimated weight of 7 to 15 kg....
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