Giganotosaurus is the biggest meat-eating dinosaur ever discovered. The fossil was found in a rock formation called Rio Limay in Argentina (1994). When alive, it measured 47 feet, weighing 8 tons, with a height of 12 feet (at the hips). Giganotosaurus was a theropod from the mid-Cretaceous, living about 100-95 million years ago, toward the end of the Mesozoic Era, or the Age of Reptiles. Giga-noto-saurus means "giant southern reptile". 70 percent of the skeleton has been found. Fossils of 75-foot-long plant eating dinosaurs were found near the Giganotosaurus, presumably victims of Giganotosaurus' 8-inch long serrated teeth and powerful jaws.

Comparison of Giganotosaurus and Tyrannosaurus Rex:

              Giganotosaurus       T.Rex
              --------------       -----
Skull length: 6 ft. (1.8 m)        5 ft. (1.5 m) 
Hands:        3 fingers            larger, with 2 fingers
Height:       12 ft. (3.7 m)       10 ft. (3 m) 
Length:       45-47 feet (14.5 m)  40 feet (12 m) 
Weight:       about 8 tons         about 5 tons 
Brain size:   small                larger and wider 
Time period:  100-95 mill. yrs.    65 million years ago 
Lived in:     South America        North America 

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