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[Nature Recordists] Artifacts in recordings?

Subject: [Nature Recordists] Artifacts in recordings?

Hello everyone!

I am new to this forum, i have looked around the topics, but have not found the 
answer to my problem, so here it is:

I got these recordings from other people i am collaborating with, and i don't 
know exactly the recording equipment or the recording conditions (like 
mic-animal distance for example). I get 2 types of odd things in the recordings 
i suspect are artifacts:

- very asymetric oscillogram, and a "smir" on the spectrogram, above and under 
the frequency band

- a less marked "smir" in the spectrogram, only above the DF, but going all the 
way to the max frequency of the recording, and extra harmonics

The second case looks a bit like what i get with a saturation, but none of 
those recordings are saturated. I thought, the second case might be a "near 
effect"? if the person put a recorder simply too close from the source. 
However, for the first case, i just dont know!! In addition those recordings 
are from species i have not necessarely worked with before, so i can't really 
tell what should be a "normal" spectrogram for those species....

Does anyone of you have an idea of what it may be? And whether i can still use 
these recordings in some way?

Thank you!

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