From the Etruscan shrew, a creature so light it could rest on your fingertip; to the bumblebee bat, the planet's smallest flying mammal, these tiny animals have developed incredible survival traits.

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The Pygmy Shrew has the distinction of being Ireland’s smallest mammal. It differs from mice in that it is tiny, has a long snout, a hairy rather than a naked tail, and red-tipped teeth.

For more than 140 years, Mixodectes pungens, a species of small mammal that inhabited western North America in the early Paleocene, was a mystery. What little was known about them had been mostly ...