Not sure, but it wouldn't be learning so much as survival of the least noticed & hardest to find. If they really knew what was going on ("round-ups") they'd be going ballistic, or should be.
I dream of our society becoming much more snake tolerant...as it is, harmless snakes are often killed too, in confusion. Gopher & bull snakes, for example, are great tail-shakers & in dry brush, it can sound like a "rattle". That's the excuse given, anyway.
could be.
i know out here in the oil patch, there are signs warning of rattlesnakes, and no “rules” against eliminating them.