The smallest mammal in the world is the bumblebee bat, also known as Kitti's hog-nosed bat (Craseonycteris thonglongyai). This tiny bat, native to Thailand and Myanmar, weighs approximately 2 grams (about the weight of a dime) and measures around 1.5 inches in length, making it one of the smallest living mammals by size. The bumblebee bat has a distinctive appearance, characterized by its small wings, rounded ears, and a short snout. It primarily feeds on insects and resides in limestone caves. Despite its small size, this bat plays a vital role in its ecosystem by helping control insect populations.