Word: groundbird
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...tall juvenile T. rex, he speculates, was probably very active, capable of scampering like a groundbird. By contrast, mid-size individuals, averaging 12 ft. to 15 ft. in height, were probably somewhat less agile and may have traveled in packs. A full-grown, 40-ft.-long, eight-ton tyrannosaur must have slowed down even more, and may even have reverted to a solitary life-style. Says Brett-Surman: "They certainly wouldn't have turned somersaults across the landscape." As for the giant herbivores, which would have required hundreds of pounds of vegetation a day to sustain their enormous bulk, they...
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