Elephants Took 24 Million Generations to Evolve From Mouse-Size - Ker Than - National Geographic News

and found that, for mammals, getting big takes longer than shrinking.

It takes a minimum of 1.6 million generations for mammals to achieve a hundredfold increase in body size, about 5 million generations for a thousandfold increase, and about 10 million generations for a 5,000-fold increase, the team discovered.

For land mammals, odd-toed ungulates

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