I have to tell you a story about that...
Back before I was a Tesla fanatic - I was a MINI Cooper fanatic. One morning my car had that kind of damage - I was able to limp to the dealership on Saturday with all manner of exciting warning lights flashing.
It was a MINI/BMW/Cadillac dealership - but the MINI guys weren't working on weekends back then. I chatted with the BMW guy - and I said "I think my cables have been chewed by rats". He replied "Oh no sir! At BMW we always tell people it's "Squirrels" - it sounds so much nicer!" ...and then from the far corner of the showroom, the Cadillac guy yells "MINK...it's mink that chew the wires on our cars!"
On Monday when they did get to fixing the wiring - the MINI guy laughed and said..."No, here at MINI, it's definitely rats."
It's comforting that the rigorously science-based Tesla guys say "Rodents" - it's a nice compromise!
And that's the truth - squirrels nest in trees - but rats (and to a lesser degree mice) do like a nice warm, dry place to nest...and they're quite happy to strip some cable insulation to make their nests. Get some rat poison and push it up against your tires when you park at night...problem should solve itself very quickly.
The big concern with the MINI was that the rat had chewed through the airbag wiring and there was a risk of the airbag going off when it shouldn't.