What is the smallest mammal in the world?

The smallest mammal in the world is the bumblebee bat, also known as Kitti's hog-nosed bat. It weighs only 2 grams, which is less than a dime, and is about the size of a bumblebee, hence the name. It is found in the jungles of Thailand and Myanmar and is classified as an endangered species.

Bumblebee bats have a distinctive pig-like nose, which helps them to echolocate and navigate in the dark. They feed on insects and usually live in colonies. Due to their small size, they are vulnerable to predators such as birds of prey and snakes, as well as habitat loss and degradation.