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I am reviewing some audio recorded with an Audiomoth a couple of weeks ago in Bolivia (south America). The target group was bats, but I found these vocalizations which are unlikely for a bat due to the duration.

Spectrogram for unknown species call, between 26 kHz - 34 kHz

The lowest frequency is approximately 26.7 kHz, the highest is 34 kHz, and the duration is almost 1 second. There are also a few calls that last around 350 ms. My recording lasted 5 minutes and the calls were emitted for most of the 5 minute period.

Since I am in the city, I thought that this could be a rodent. The most similar vocalizations I found are for rats, although the call is categorized as a 22 kHz call and has a shorter duration https://www.mdpi.com/2076-3425/11/4/459 .

Thanks.

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Disclaimer: There are for sure people with more expertise on this topic out there.

For, me it looks like a Black Rat. Compared with the appendix of the work of Newson et al. 2020, I would go with Black Rat. That corresponds with your guess and the environment. You can check out the work here, its worthwile. The Appendix gives some examples, found at the bottom of the page.

Cheers, Dominik

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