Roughly weighing 30 grams and measuring 2.5 in long, the Pygmy Mouse Lemur (Microcebus myoxinus) right, is the smallest living primate. The highly endangered species is found deep in the forest of Madagascar. During breeding season, the males become larger than the females as the male lemur goes through a Testicular Cycle—the testes drastically increase in size and weight.

Why not take a look at some of the other smallest living mammals?

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