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Sound ID Reckahn NE-Germany from today (1 Viewer)

I hope you get an answer, Alexander my friend. I can hear a soft rattle in 1 and 2, along with edible? frog croaking, but I can't open 3. It is very soft and the croaking is louder and different. You may be onto something there. Baillons's has a "soft, dry rattle varying in volume... 2-3 seconds" Collins 2nd Ed, but, I have hearing aids and only for a year, so not that practiced with them yet.
 
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Cheers Alexander, I can open all the links on flicker, but I don't anything extra. I think the soft rattle is not the frogs as they sound louder and of a different frequency. The xeno canto XC745912 Baillon's Crake (Zapornia pusilla) :: xeno-canto and some around it from Poland sound like it in frequency and length if you turn the volume down to the same level as your bird. I think it its a Baillon's Crake as you are hoping for.
 
I put it through MP4 to WAV | CloudConvert (there are also other similar websites) and could visualise the sonogram thanks to Merlin. There are small patches of white in some places, that--I think--wouldn't be there if it were recorded on the phone with Merlin (.mp4 seems to hold less information than .wav). I don't know how to make a sonogram from an .mp3 file, but XC does (.wav files can now also be uploaded to XC). I don't know how to extract and download the sonogram the way XC enables us to do.
 

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Attached is a spectrogram from the third video (the video starts with the ticking noise, and then the second call is clearest I thought.
You can see that the frequency is between 1 and 2kHz, quite unlike any of the recordings I checked on Xeno-Canto. Ex: XC697886 Baillon's Crake (Zapornia pusilla) sounds quite low, but looking at the spectrogram the call is in the 2 - 5 kHz range (though lower is maybe just too noisy to see)

I'm not hearing it as a Baillon's Crake based on the few I checked on Xeno-Canto.
To me the sound isn't the same quality. It sounds almost more like a woodpecker's drumming to me.

To view a spectrogram with Audacity (free software), you can open the audio file (.wav / .mp3 ...) and then click the dropdown on the left to pick Spectrogram. Usually I'll change the spectrogram settings so it's Grayscale, and up the window size a bit -- just play around till it looks ok. Usually you want to normalize/amplify the recording too. The internet probably has lots of tutorials on how to use Audacity if you are interested in audio recording / processing

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