This artist rendering provided by Science,  K. Curry Rogers, M. Whitney, M. D'Emic, and B. Bagley, shows a  titanosaur, a silhouette representing the size of a hatchling titanosaur, relationship to a human at birth, tiny titanosaur babies weigh about as much as average human babies, 6 to 8 pounds. But in just a few weeks, they're shedding the tiny descriptor and are at least the size of golden retrievers, weighing 70 pounds, knee-high to a person. And by age 20 or so, they're bigger than school buses. (Science/K. Curry Rogers, M. Whitney, M. D'Emic, and B. Bagley via AP)
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