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11 of the smallest mammals in the world

By: Bryan Nelson on Nov. 17, 2010, 10:18 a.m.
Long-tailed Planigale

Photo: Alan Couch/Flickr

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Long-tailed planigale

You might say that "planigale" is Australian for "small". These little guys, native to the land down under, are the world's smallest marsupials.

Their small size is exemplified by their flattened heads, which are typically one fifth as deep as they are wide. This adaptation allows planigales to squeeze into crevices and cracks any other mammal would find impossible. They weigh in at under 5 grams and reach lengths averaging under 60 millimeters.