Picture 1
20 seconds of continuous bat activity.
Details show a bug zap during the first 1.5 sec (see Picture 2)

Picture 2
Magnification of 0-1.5 s region of Picture 1.
0805-5b (1s, 8 kb mp3)
The pulse train speeds up to a maximum, then silence ... for .2 seconds. Is that enough time to swallow a bug?

Picture 3
Magnification of region around 17 s in Picture 1.
0805-5c (1.9s, 12 kb mp3)
Several high frequency pulses. The sonogram shows energy peaks around as 4.75 khz audio, 76 khz ultrasound with energy still present one octave higher, around 152 khz.

Picture 4
Magnification of seconds 19-20 of Picture 1.
0805-5d (1.9s, 12 kb mp3)
It looks like a blob, but it sounds strange and under higher magnification (next Picture) this proves to be a very fast pulse train, of the type first seen in 0805-1.

Picture 5 -- Time axis in audio samples, 32000 samples = 1 sec
Magnification of seconds 0.55 to 0.75 of Picture 4.
This closeup resolves part of previous picture into a fast pulse train with 17 pulses over 1/10 th of a second (3200 samples), for a pulse rate of 170 hz. the highest we've seen yet. The sonogram indicates an ultrasound frequency of 2.25*16 = 36 khz.