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11 of the smallest mammals in the world

Bumblebee Bat

Photo: Daniel Hargreaves/Bedfordshire Bat Group

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Bumblebee bat

The bumblebee bat, also known as Kitti's hog-nosed bat, is the world's smallest bat and the smallest mammal in the world based on skull size.

Weighing in at just around 2 grams, it's so small that you might actually confuse one for a bumblebee if it went buzzing by your ear in the night.

Unfortunately, its delicate size is also indicative of its biological status. The IUCN lists the animal as vulnerable, and a few roosting populations are at risk of extinction due primarily to human activity.