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The '''Tyrannosaurus rex''', or T-rex, was a large carnivorous [[dinosaur]] with very small forelimbs, large hind legs and a long tail. It is one of the largest land carnivores to have ever walked the earth, measuring about 13 meters long and 5 meters high.<ref>Brochu, C.R. 2003. Osteology of Tyrannosaurus rex: insights from a nearly complete skeleton and high-resolution computed tomographic analysis of the skull. Memoirs of the Society of Vertebrate Paleontology. 7: 1-138.</ref>  

The '''Tyrannosaurus rex''', or T-rex, was a large carnivorous [[dinosaur]] with very small forelimbs, large hind legs and a long tail. It is one of the largest land carnivores to have ever walked the earth, measuring about 13 meters long and 5 meters high.<ref>Brochu, C.R. 2003. Osteology of Tyrannosaurus rex: insights from a nearly complete skeleton and high-resolution computed tomographic analysis of the skull. Memoirs of the Society of Vertebrate Paleontology. 7: 1-138.</ref>  

[[Theory of evolution|Evolutionary]] scientists believe that the T-rex lived at the end of the [[Cretaceous]] period, approximately 65 million years ago.

[[Theory of evolution|Evolutionary]] scientists believe that the T-rex lived at the end of the [[Cretaceous]] period, approximately 65 million years ago, and that modern birds are the descendants of dinosaurs such as T-rex. <ref>[http://www.cnn.com/2007/TECH/science/04/12/dinosaur.reut/index.html Bird Family Ties]</ref><ref>[http://www.livescience.com/animalworld/ap_trex_tissues.html T Rex Tissue]</ref>

However, [[Young Earth Creationism|Young Earth Creationists]] believe that they became extinct sometime since the [[Great Flood]], which was approximately 4,500 years ago.

However, [[Young Earth Creationism|Young Earth Creationists]] believe that they became extinct sometime since the [[Great Flood]], which was approximately 4,500 years ago.