Which mammal has the largest change in size from birth to fully grown percentage wise?
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8$\begingroup$ I guess it maybe a marsupial for example red kangaroo. $\endgroup$– JM97Dec 15, 2016 at 12:07
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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.
answered Dec 15, 2016 at 17:33
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$\begingroup$ Although platyplus babies are almost the size of a jellybean, their baby to adult ratio isnt much. Because adult platypus usually extend upto 15 inches. $\endgroup$ Dec 18, 2016 at 0:35