Javan mastiff bat

The Javan mastiff bat (Otomops formosus), also called the Java giant mastiff bat, is a species of bat in the family Molossidae that is endemic to Indonesia. It is known only from two localities in West Java Province, Cibadak and Cibodas in the Bogor area just south of Jakarta, and in total from just four specimens, none recorded since 1990. Pairs of males have been found roosting together in tree hollows, one in a nesting hole in the dead limb of a rubber tree at about 400 metres in 1938 and two in a tree hollow at about 1,450 metres in 1990. The head and body measure 79 to 86 millimetres and the weight is about 26 to 27 grams. The short, velvety fur is deep blackish brown with a grayish buff mantle across the neck and upper back, and the large ears carry small horny points. It is classed as Data Deficient, and taxidermied specimens said to be this bat are often offered for sale online.