this post was submitted on 25 May 2024
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that last bit tells me you're either old or have hearing damage: we have some bats around me and despite never once seeing them it's plainly obvious to me that they exist thanks to their shrill squeaky calls in the twilight.
https://www.youtube.com/watch?v=X4eqkaHkTAI
Linking to a guy using an expensive ultrasonic mic to hear bats doesn't really support youe statement that you're hearing bats around you despite never seeing them. Maybe you have hearing damage?
he literally says in the video that their calls range from 20kHz to 200kHz, with 20kHz being the normal top range of human hearing for someone without hearing damage.
WHAT?