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11 of the smallest mammals in the world

Pygmy Possum

Photo: Conservation International, Bruce Beehler/AP

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Pygmy possum

Ranging in length between 5 and 10 centimeters and often weighing in at barely over 10 grams, these mini marsupials are found hanging upside down in trees in Australia and New Guinea.

They are so small and so difficult to spot that a new species of pygmy possum was just discovered as recently as 2005.