The world's smallest mammal is the bumblebee bat, scientifically known as Craseonycteris thonglongyai. Also known as Kitti's hog-nosed bat, this tiny species weighs about 1.5 to 2 grams and has a wingspan of approximately 5.7 inches. Native to parts of Thailand and Myanmar, its minuscule size makes it fascinating yet vulnerable to habitat loss and environmental changes. It primarily inhabits limestone caves where it roosts and forages for tiny insects.