Frantisek wrote:

Mhm bats...
Some years ago when doing more ornithology and similar we were
catching bats for ringing them and I remember the little blighters
were very smart. Most were able to sonar-detect quite fine nets if
there was even the slightest wind and simply evade them in a
right-angle maneuver that would tear an F16 to pieces ;-)

F16s catch mosquitos in quite a different way to bats......


How about rigging up the detector to the video, in such a way you could simply search for the peaks in sound track when they fly in/out of the hole? They must use sonar when flying in/out, don't they...

Interesting idea - thanks.



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