Lesser bicolored leaf-nosed bat

The lesser bicolored leaf-nosed bat (Hipposideros atrox) is a leaf-nosed bat of Southeast Asia, native to Malaysia, Indonesia and Thailand, recorded from 9 to 860 metres above sea level. Danish mammalogist Knud Andersen described it in 1918 as a subspecies of Hipposideros gentilis from a holotype collected in Selangor, Malaysia. John Edwards Hill later placed it as a subspecies of the bicolored roundleaf bat in 1963, and it was recognized as a full species in 2010, a step the IUCN followed in 2019. Its forearm measures 40.7 to 46.0 millimetres, and males average 6.6 grams and females 7.0 grams. It navigates and finds prey by constant frequency echolocation, with maximum energy near 142 kHz, and roosts by day in sheltered places such as caves shared with other Hipposideros species. The IUCN rated it Least Concern in 2019 because of its wide range, presumably large population and tolerance of landscape disturbance.