What evolutional benefit is that?

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[–] 23 points 3 years ago (4 children)

T. rex was around for 20 million years or so, I’d say they passed for long enough to be considered successful. Despite the tiny arms.

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  • [–] 5 points 3 years ago (3 children)

    I think that's been narrowed down to about 2 million years. But that got cut short by a mass extinction event, so it's hard to say how long they would have lasted otherwise.

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