pspspsps is biological , it's common noise to get a cats attention (in many places) because it stimulates their prey drive.
maybe the phoneme sequence of plosive -> sibilant is easy to discern from background noise?<a href="https://en.wikipedia.org/wiki/Plosive" rel="nofollow">https://en.wikipedia.org/wiki/Plosive<a href="https://en.wikipedia.org/wiki/Sibilant" rel="nofollow">https://en.wikipedia.org/wiki/Sibilant
hmokiguess · · focus · HN ↗
YeGoblynQueenne · · focus · HN ↗
astura · · focus · HN ↗
jjtheblunt · · focus · HN ↗
<a href="https://en.wikipedia.org/wiki/Plosive" rel="nofollow">https://en.wikipedia.org/wiki/Plosive
<a href="https://en.wikipedia.org/wiki/Sibilant" rel="nofollow">https://en.wikipedia.org/wiki/Sibilant