The canine is small but well developed and is noticeably set apart from the other teeth. The premolars are all in close contact with the other teeth and the molars are approximately equal in size and form. There seems to be no sexual dimorphism in N. micropus . These frequencies can get up to 170kHz, which are emitted through the mouth. One study reported the capture of a single nursing mother in August, and the capture of about 56 females that were not nursing during the months of January, March and December.
Nothing is known about the dates of reproduction.
Behavior Little is known about the behavior of N. micropus . They are found in loose clusters of up to several hundred individuals. These colonies roost on the undersides of low ledges in deep caves. N. micropus is also known to be a rather slow flyer. They have also been found living in dark mines and tunnels but is very rare.