What is the name of the tiny shrew species, weighing just 3 grams, discovered in December 2025?

The tiny shrew species, weighing a mere 3 grams and formally described in late 2025, is known as Crocidura stanleyi. This diminutive mammal, often compared to the weight of a sugar cube or a penny, was discovered in the biodiverse Ethiopian highlands. Its identification adds a significant new entry to the roster of the world's smallest mammals, highlighting the ongoing scientific exploration of our planet's hidden biodiversity.

The story behind Crocidura stanleyi spans over a decade. Initial specimens were collected as far back as 2015 by mammalogist William T. Stanley, after whom the species is now named. Tragically, Stanley passed away shortly after his initial fieldwork, never seeing his hunch confirmed. It took years of meticulous research by his colleagues, involving both new field samples and advanced genetic analysis, to definitively establish it as a distinct species. This collaborative effort culminated in its formal scientific description in December 2025 and early 2026.

Measuring approximately 5 centimeters in body length with an additional 3-centimeter tail, Crocidura stanleyi is characterized by its dark, brownish-gray fur on its back and lighter gray underside, along with a slightly flattened head. Its existence underscores the rich and often overlooked mammalian diversity present in the rugged, isolated plateaus of the Ethiopian highlands, an area renowned for its endemic species. The discovery of such a small and elusive creature also emphasizes the importance of continued fieldwork and advanced scientific techniques in uncovering new life forms, even in seemingly well-studied regions.