Elephants Took 24 Million Generations to Evolve From Mouse-Size

National Geographic: Some mammals need roughly 24 million generations to go from mouse-size to elephant-size, a new study says. Using both fossil and living specimens, scientists calculated growth rates for 28 different mammalian groups during the past 65 million years-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......

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