The Etruscan Shrew holds the title for being the smallest living mammal in the world today, measuring just 4cm in length!

Contrary to popular belief, this mouse-like creature is not actually related to rodents but shares a closer relationship with hedgehogs, which is quite surprising! It can be found across a wide range spanning Europe, the Middle East, the Indian Subcontinent, and Southeast Asia. As adults, they weigh a mere 1.3–2.5 grams and possess an incredibly fast metabolism, requiring them to consume food equivalent to 1.5–2.0 times their own body weight, typically consisting of insects.

However, it’s worth noting that the Etruscan Shrew is not the smallest mammal that ever existed. During the early Eocene period, approximately 50–55 million years ago in North America, a species called Batodonoides belonged to an extinct sister group of shrews within the same mammal order that also includes hedgehogs and moles. Based on fossil evidence, Batodonoides was slightly smaller than the Etruscan Shrew and was estimated to weigh around 0.93–1.82 grams as an adult.