Kitti's hog-nosed bat (Craseonycteris thonglongyai) of Thailand and Burma is the smallest living mammal. Kitti's hog-nosed bat also known as the bumblebee bat is a vulnerable species of bat.
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It is about 29 to 33 mm (1.1 to 1.3 in) in length and weighs only about 1.5 to 2 g.
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It has a reddish-brown or grey coat, and a distinguishing flat and pig-like nose. While the ears of Kitti's hog-nosed bat are relatively large, its eyes are small. The wings of this mammal are relatively large too, that allow the bat to hover.
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It feeds on small flies and spiders.
Read more at: http://en.wikipedia.org/wiki/Kitti's_hog-nosed_bat