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Photo Gallery: Animal Record Breakers

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Scientists have long debated the speed and agility of this prehistoric giant. While some propose that T rex. was capable of nothing more than a leisurely jog, other investigations have shown that the six-ton (5.4-metric-ton) predator could possibly have outrun an Olympic sprinter, reaching a top speed of 18 miles an hour (29 kilometers an hour). Illustration by Michael Skrepnick