| Summary: | Our study objectives were to determine bat species composition and to study the genetic variations and sound characteristics in bats of the Kharaa, Shatan, and Ulgii areas of Mongolia. This study is the first bat survey in this area. Nineteen species were from Mongolia. Six bat species belonged to three genera. We performed mitochondrial DNA sequencing of Myotis bombinus, Myotis gracilis, and Myotis petax to confirm the morphological identification of these species. We also determined the sound frequencies of the six bat species, based on their echolocation calls. The conservation status was determined using World Conservation Union red list categories and criteria. Sixteen bats from three species were ringed during this study and three artificial boxes were placed on trees in the Kharaa River Valley. Other than the northern bat, all species were eastern Palearctic. The northern bat (Eptesicus nilssonii) species is widespread in the northern Palearctic region.
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