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One of the smallest of all mammals is the Lesser bamboo bat (Tylonycteris pachypus) also known as the bumblebee bat which lives throughout Southeast Asia. The animals range from India and China down through Myanmar, throughout the Malaysian Peninsula, and across the island chains of Indonesia and the Philippines. The tiny flying creature is ridiculously small and measures only 40 millimetres (1.6 inches) in length with a wingspan of 150 millimetres (5.9 inches). An adult bat weighs approximately 1.5 grams–only slightly more than a paper clip.
As you will notice from the photo, the bamboo bat has a flat skull. This is to aid the creature as it crawls into its daytime hideout—a single segment of bamboo—which the bat is capable of squeezing into through cracks of as little as 4 millimeters in width (if you didn’t pull out your desk ruler earlier to assess the size of this bat, you should do so now to remind yourself how small 4 millimeters is). Like most vesper bats, the lesser bamboo bat lives on flying insects which it catches in the dark night skies by means of sonar and extraordinary flying prowess. The lesser bamboo bat is said to have a particular relish for termite swarms.