Britannica Learning Library Volume 03 - Science and Nature by Encyclop?dia Britannica, Inc.

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Rex in Chicago’s Field Museum, was sick when she was alive. Researchers say that she suffered from gout, a painful disease that causes swelling in bones and joints. ” © 2008 Encyclopædia Britannica, Inc. ★ Courtesy, Field Museum 53 SE A T GH RCH LI Mammoths and mastodons are related to a) horses. b) elephants. c) dinosaurs. This woolly mammoth was painted as part of a museum exhibit. But primitive artists first painted these creatures on the walls of caves. © Jonathan Blair/Corbis 54 © 2008 Encyclopædia Britannica, Inc.

Tyrannosaurs lived mainly in what is now North America and Asia. The creature was about 40 feet long from its head to its thick and heavy tail. The tyrannosaur probably stooped forward, with the big tail balancing its weight when it walked. The tyrannosaur had large, powerful rear legs but small front arms. These forearms wouldn’t even have been able to reach its mouth. So the tyrannosaur probably planted its clawed rear feet on a dead animal, bit hard, and ripped the flesh away from the carcass.

Ancestors t n ta is d e th s were e, its bone c n ta s in r o F eir size, eight for th tw h g li ry ve its s’ are. And just as bird bles sture resem o p g in lk a w . dern birds that of mo 52 © 2008 Encyclopædia Britannica, Inc. SE A LEARN MORE! READ THESE ARTICLES… DINOSAURS: GIANTS OF THE PAST • ENERGY • FOSSILS T GH R t was longer than a bus, weighed more than four tons, and had teeth up to a foot long. The tyrannosaur may have died out 65 million years ago, but it is still one of the largest meat-eating land animals that ever lived.

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