Why can I hear bat cries if they should be ultrasonic?

[knockout_artist]

Homework Statement

I downloaded wave files of bat cry. I played it on computer And I was able to hear it?
Shouldn't that be ultrasonic??

Here is the sample

http://www.sound-effect.com/sounds1/animal/batsounds/bat1.wav

 

[Kurdt]

How do you think you are able to hear it? What could they have done to the sound to make you able to hear it?

 

[knockout_artist]

Did some tempered it? re-modulate it on lower frequency so we could hear it?

 

[DaveC426913]

Bats use a whole range of frequencies.

 

[knockout_artist]

oh
you mean if use fft on the sound file I will see frequency above haring range??