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Which mammal has the largest change in size from birth to fully grown percentage wise?

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    $\begingroup$ I guess it maybe a marsupial for example red kangaroo. $\endgroup$
    – JM97
    Dec 15 '16 at 12:07
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    – MattDMo
    Dec 18 '16 at 17:56
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@JM97 is correct.

According to National Geographic >>

The gestation period of a Red Kangaroo is 33 days and it's baby at birth weighs a mere 0.03 oz. To put it into a more precise perspective, on birth, the baby weighs 1/100,000 of an adult red kangaroo's weight.

Second place goes to the baby of a Giant Panda; at birth it weighs 3.2oz which is 1/900 of an adult giant panda's weight.

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