Interesting. Even so much that after a 14 hour road trip I read a little more about it.
The first thought was “hearing?” but then I remembered that I heard electricity before, standing next to a transformer.
According to what I read this is something different, though. High voltage is audible due to ionized air in close vicinity, while home appliances can be audible due to AC power shifting magnetic fields and that can make internal components vibrate.
Anecdotally, I believe I have heard close hitting lightnings - just before happening - in my power grid.
It’s not any snake, but some species that are adapted to living on trees. It’s also not really flying. Gliding would describe what they do better. As they jump, they flatten their body and make slither movements through the air, gliding maybe at a 45 angle downwards.