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Stacker compiled a list of 25 of the smallest mammals in the world using AnimalTraits as a reference. All mammals listed have a mass under 1 pound.

Manop Boonpeng // Shutterstock All mammals that inhabit the earth today descended from one common ancestor called the Morganucodon--a tiny shrewlike creature that lived alongside the dinosaurs roughly 200 million years ago. Competing for resources wi...