Morcegos_1_24-06-2018.wav

Might not sound like much, but I am very proud of this sound recording!

Yesterday me and my wife went for a walk to a nearby park. It was almost 10pm, the sky still fired up with the colours of twilight (only really gets dark around 10:30, at London's latitude during the longest days of summer).
The weather has been quite hot and outside felt very comfortable, that is why we went for a walk.

We saw several bats fliying around catching insects.

So, the following day, I went to the same location with my youngest daughter. This time armed with my trusty Zoom H1 recorder.
The recording mode set to 96kHz, 24-bit.
I was not sure this would work, because I did not know if the Zoom H1 built in mics would be sensitive enough in the ultra-sound range.
I am happy to report that they are!

This is a section taken from about 5 min into a ~8 min recording.
Original recording processed in Audacity. Filtered out all sounds below 500Hz. Amplified as needed. Then reduced speed to 0.33.

You can clearly hear the bats sonar pinging in search mode and then chirping rapidly when they are chasing a prey.