A listener finds a bat in the office (!) and wonders what species it was. The tail gives it away.
Brazilian Free-Tailed Bat
![Brazillian Free-Tailed Bat (Tadarida brasiliensis mexicanus)](https://npr.brightspotcdn.com/dims4/default/ea92c8f/2147483647/strip/true/crop/1024x571+0+0/resize/880x491!/quality/90/?url=http%3A%2F%2Fnpr-brightspot.s3.amazonaws.com%2Flegacy%2Fsites%2Fwltr%2Ffiles%2F201712%2FBrazillianFreeTailedBat.jpg)
J. N. Stuart [CC BY-NC-ND 2.0] via Flickr
A listener finds a bat in the office (!) and wonders what species it was. The tail gives it away.