(Before It's News)
Ruling our planet as the dominant terrestrial vertebrates for 135 million years, dinosaurs were the largest creatures that ever inhabited Earth. The biggest sauropod dinosaurs may have achieved lengths of 190 feet and heights of over 30 feet, which is, in modern terms, an incredible size. Not all dinosaurs were that large; there were creatures just about 20 inches long but even these little beasts usually looked scary. From the little known Mapusarous to the legendary Tyrannosaurus Rex, check out these 25 terrifying dinosaurs.
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