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Other contributors have said "How big are giant tortoises?" is the same question as "How big can a giant tortoise grow?". If you believe that these are not asking the same thing and should be answered differently, click here.

Answer:

Growth factors include availability of food, lack of predation, and genetic proclivity for large size. Given all these variables, a tortoise could achieve the size of a small dinosaur or a large mammal.

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